Irregular Corneal Astigmatism & Cataract
|
|
- Emerald Hudson
- 5 years ago
- Views:
Transcription
1 Costas Karabatsas MD, PhD, MRCOphth, FEBOphth, FRCS Ophth Irregular Corneal Astigmatism & Cataract (assessing ocular surface, IOL selection)
2 In both LRS and Cataract Surgery aim = Emmetropia Refractive expectations of cataract surgery patients today are very high. Expecting emmetropia as if they had LRS performed Spherical emmetropia is relatively easily achieved after cataract extraction nowadays 2
3 Preop (subjective) astigmatism is a combination of corneal AND lenticular astigmatism Provided that our IOL is correctly positioned and not creating astigmatism Postop refractive astigmatism will depend upon the neutralization of corneal astigmatism with a combination of techniques In order to fully correct corneal astigmatism, this has to be properly evaluated first
4 Preoperative astigmatism evaluation Today we can improve our refractive cataract surgery outcomes by skillful interpretation of corneal mapping Placido Scheimplug Cassini 4
5 Placido systems 5
6 Oculyzer (Scheimpflug) 6
7 Cassini 7
8 Irregular Astigmatism definition has changed 8
9 Astigmatism definition 9
10 Astigmatism classification 10
11 11 PK astigmatism classification based on corneal topography Karabatsas CH et al : Proposed classification for topographic patterns seen after penetrating keratoplasty Br J Ophthalmol 1999; 83:403-9.
12 12
13 Post-PK astigmatism M. 6 M. 9 M. 12 M. Non astigmatic REGULAR IRREGULAR 13
14 RESULTS Oblate Asymmetric Bow-Tie (OABT) was the regular pattern more often found in keratoconic corneas.
15 Irregular Astigmatism management Before cataract surgery At the same time as cataract surgery After cataract surgery
16 Μethods of Astigmatism Correction 1) by changing Corneal Curvature Astigmatic keratotomies (straight / arcuate) Relaxing keratotomies near limbus ΡRΚ / LASIK Femto RKs 2) by refractive neutralization of existing Corneal Astigmatism Toric intraocular lenses 16
17 Astigmatism correction at the time of surgery implanting toric IOLs executing laser arcuate incisions the simplest and most cost-effective is the manual LRI
18 18
19 Residual astigmatism correction with T-IOL 19
20 ΑSTIGMATIC KERATOTOMY (ΑΚ / LRIs) Used in : Naturally occurring astigmatism Postoperative astigmatism Post cataract surgery Post - PKP Post PRK KC Athens
21 nomograms ASTIGMATIC KERATOTOMIES instruments corneal topography (placido) results 21
22 Cataract Onaxis Incision 22
23 2 3 Corneal Architecture Corneal behavior is similar to an elastic dome, which is placed over a round scaffold (limbus) with a diameter remaining always stable, despite any procedures to the surface of the dome
24 Βasic Principles of Astigmatic Keratotomy 1. The AK is always placed on the STEEP meridian [ (+) cyl axis ] 2. Transverse sections on the (+) axis result in FLATTENNING of this meridian, with concurrent steepening of the meridian at 90 ο 24
25 Refractive result of a Transverse Relaxing Incision INCREASE of R => FLATTENING of the cornea => Reduction of refractive power over this meridian 25
26 Βasic Principles of Astigmatic Keratotomy 3. The closer to the optic axis the transverse keratotomies (small ΟΖ), the greater effect 4. > 2 pairs of TK on the same meridian do not increase significantly the astigmatic result 5. Keratotomy depth < 80% 6. Max keratotomy length is 3 clock hours [90 ο ] (spheq ct) 26
27 Straight transverse T- cuts single symmetric pair multiple Arcuate transverse T symmetric pair asymmetric pair TRANSVERSE KERATOTOMIES but always transverse to (+) axis 27
28
29 What is an LRI? Partial-thickness penetrating incisions typically placed within 1 mm of the limbus and, as such, can more accurately be named peripheral corneal relaxing incisions. These incisions can effectively correct upwards of 1.25 to 1.50 D of corneal astigmatism. A preset depth of 600 µm can be used, as can a variable depth with pachymetry set at 90% of the thinnest pachymetry reading. well-established nomograms Koch/Wang, Nichamin Age Pachymetry Adjusted Intralimbal Astigmatic [NAPA] Donnenfeld
30 LRIs tips Manual limbal relaxing incisions (LRIs) and LRIs in general can produce a hyperopic shift of about 0.20 D, so it is sometimes advisable to choose a higher-powered IOL than is suggested by the IOL power calculation Any bleeding from corneal neovascularization can blunt the desired flattening effect of the LRI If an overcorrection occurs, it is safest to wait 2 to 3 months before performing any enhancements.
31 A slight undercorrection can instantaneously be adjusted by creating a new LRI central to the existing one or lengthening the existing LRI (Figure)
32 Manual LRIs Although manual LRIs can be less predictable than other options, they are a triedand-true strategy for correcting low levels of corneal astigmatism. Every cataract surgeon who is committed to maximizing refractive outcomes should be knowledgeable about and proficient at performing this particular type of corneal relaxing incision
33 LRIs advantages : LRIs are cost-effective. LRIs are an excellent means by which to fix low amounts of astigmatism (< 1.00 D) when a toric IOL is not available for the patient, they are also a less expensive option than a toric IOL. usually taking less than 5 minutes to perform. manual incisions are ergonomically friendlier for the surgeon and more comfortable for the patient than laser arcuate incisions. they can be performed on the spot, not the case with toric IOLs or laser arcuate incisions.
34 Why should you perform manual LRIs?
35 35
36 video
37 Femto AK
38
39
40 Correction of residual astigmatism by refractive surgery PRK LASIK Topography-guided ablations 40
41 Topo-guided LASIK advantages Correction of irregular astigmatism Regular & smooth corneal surfaces can be obtained (improved BSCVA) Transition zone size can be topo-guided to maintain a constant minimum 360 o to avoid regression μm of ablation can be saved compared to standard ablation 41
No financial interest
Management of high astigmatism after penetrating keratoplasty Ahmed Sherif MD Assistant Professor of Ophthalmology Cairo University No financial interest 1 Incidence Several reports state that 15-31% of
More informationFemtosecond Cataract Surgery: Correction of Astigmatism and Complex Cases Financial Disclosures Femtosecond Laser Utility in Cataract Surgery
1 2 3 4 5 6 7 Femtosecond Cataract Surgery: Correction of Astigmatism and Complex Cases Michael J Taravella, MD Director: Cornea and Refractive Surgery University of Colorado Financial Disclosures Consultant
More informationArthur Cummings FRCSEd
How to Improve your Refractive Cataract Surgery Outcomes by Skilful Interpretation of Corneal Mapping Course IC-16 ESCRS Copenhagen 10 th September 2016 Consultant for Alcon / WaveLight/TearLab Arthur
More informationAssessment & management of irregular astigmatism
Assessment & management of irregular astigmatism Athens, March 2018 D. Epstein, MD, PhD, FARVO No financial interest What is an irregular astigmatism? A question that starts at the wrong end... How about
More informationPremium treatment starts with premium diagnosis
by i-optics Premium treatment starts with premium diagnosis Complete your cataract-refractive platform The premium IOL opportunity Premium IOL market to nearly double in next 5 years 2013 1.6 million 22
More information* Villegas EL, Alcón E, Artal P. Minimum amount of astigmatism that should be corrected. J Cataract Refract Surg 2014; 40: n My SIA: Ø Centroid
Astigmatism correction in cataract surgery: A work in progress 9 things you should know Douglas D. Koch, M.D. Cullen Eye Institute Baylor College of Medicine Houston, Texas Financial disclosure: AMO Alc
More informationThe Short Term Effects of a Single Limbal Relaxing Incision Combined with Clear Corneal Incision
pissn: 1011-8942 eissn: 2092-9382 Korean J Ophthalmol 2010;24(2):78-82 DOI: 10.3341/kjo.2010.24.2.78 Original Article The Short Term Effects of a Single Limbal Relaxing Incision Combined with Clear Corneal
More information2Optimizing the Refractive
Chapter 02 3/4/11 4:29 PM Page 1 2Optimizing the Refractive Outcome: Correction of Astigmatism in Cataract Surgery By: Robert M. Kershner, M.D., FACS General Considerations Lens extraction with the implantation
More informationIndex. D DALK, 69, 155 Differential sector index (DSI), 92 Discriminant function analysis, DMEK, 23 Donor factors, 156 DSAEK, 23
A Abberrometry, intraoperative, 66 Aberrated corneas, topography-guided laser for, 146 Aberration coefficient, 99 corneal, 94 Ablation cylindrical, 131 hyperopic, 130, 131 pattern, design and planning,
More information4/9/2016. Sources of. Single-angle vs. double-angle plots for astigmatism data. Commercial Toric IOL calculators. Unexpected residual astigmatism!
Sources of Corneal astigmatism measurements Methods of calculation Corneal surgically induced astigmatism (SIA) Toric IOL misalignment Unexpected residual astigmatism! Single-angle vs. double-angle plots
More informationDisclosure. Getting Up to Date with LASIK. Modern advancements LASIK. What we re curing. Changing the corneal surface
Getting Up to Date with LASIK Disclosure I am not a paid consultant to any drug or device company. Stillwater, MN Adjunct Associate Professor University of Minnesota LASIK Use one instrument to make a
More informationToric intraocular lenses
Supplement to EyeWorld August 2015 Driving adoption and outcomes with toric IOLs: Pre-, intra-, and postoperative pearls for success 2014 ASCRS Clinical Survey: Trends in toric IOL implementation Click
More informationDOWNLOAD ASTIGMATIC TECHNIQUE IN ONE STEP RAINBOW HOLOGRAPHY
ASTIGMATIC TECHNIQUE IN ONE PDF DOWNLOAD 1 / 5 2 / 5 3 / 5 astigmatic technique in one pdf astigmatic technique in one pdf Signs and symptoms. Although astigmatism may be asymptomatic, higher degrees of
More informationArcuate Keratotomy for High Postoperative Keratoplasty Astigmatism Performed With the IntraLase Femtosecond Laser
Arcuate Keratotomy for High Postoperative Keratoplasty Astigmatism Performed With the IntraLase Femtosecond Laser Luca Buzzonetti, MD; Gianni Petrocelli, MD; Antonio Laborante, MD; Emilio Mazzilli, MD;
More informationClinical results of arcuate incisions to correct astigmatism
Clinical results of arcuate incisions to correct astigmatism Kurt A. Buzard, MD, Eduardo Laranjeira, MD, Bradley R. Fundingsland, BS ABSTRACT Purpose: To evaluate the effectiveness of arcuate incisions
More informationAXsys Studay Data and Press Release Reference
Clinically Tested to be the World s Most Accurate Toric Marking Device AXsys Studay Data and Press Release Reference Press Release Reference electronic leveling device for implantation of a toric iol The
More informationHandout Course Title : Astigmatisme Management with toric IOL
Handout Course Title : Astigmatisme Management with toric IOL ESCRS Milano 2012 Level :Basic Course leader : Jerome jean Bovet Course duration : 2 hours Faculty : Jerome Bovet, Warren Hill Keiki Mehta
More informationLASIK for post penetrating keratoplasty astigmatism and myopia
Br J Ophthalmol 1999;83:113 118 113 The Eye Institute, Chatswood, NSW, Australia S K Webber M A Lawless G L Sutton C M Rogers Correspondence to: Dr Michael Lawless, Level 3, 7 Victoria Avenue, Chatswood,
More informationNon-penetrating Femtosecond Laser. intrastromal astigmatic keratotomy (ISAK) Patients With Mixed Astigmatism After Previous Refractive Surgery
ORIGINAL ARTICLE Non-penetrating Femtosecond Laser Intrastromal Astigmatic Keratotomy in Patients With Mixed Astigmatism After Previous Refractive Surgery Jan Venter, MD; Rodney Blumenfeld, MD; Steve Schallhorn,
More informationProposed classification for topographic patterns seen after penetrating keratoplasty
Br J Ophthalmol 1999;83:403 409 403 Department of Ophthalmology, Bristol Eye Hospital, Bristol C H Karabatsas S D Cook J M Sparrow Correspondence to: Costas H Karabatsas, PO Box 16757, Athens 115 02, Greece.
More informationEvaluation of Opposite Clear Corneal Incision in Controlling Astigmatism in Cataract Patients Undergoing Phacoemulsification Surgery
Evaluation of Opposite Clear Corneal Incision in Controlling Astigmatism in Cataract Patients Undergoing Phacoemulsification Surgery J.S.Bhalla, Meenakshi Rani, Surbhi Gupta Department of Ophthalmology,
More informationDouglas Katsev MD Sansum Clinic Chairman Ophthalmology Santa Barbara CA
Early Outcomes (9 months) with a Toric Accommodating IOL How do They Fit in My refractive Practice Douglas Katsev MD Sansum Clinic i Chairman Ophthalmology Santa Barbara CA 1 Disclosure Consulting Fee:
More information2nd ESASO Anterior Segment Academy April 2016, Milano/Italy
2nd ESASO Anterior 28 30 April 2016, Milano/Italy Istituto Clinico Humanitas Humanitas Congress Centre Via Manzoni, 56 20089 Rozzano, Milan Congress Chairmen: José L. Güell, Paolo Vinciguerra www.esaso.org/2nd-esaso-anteriorsegment-academy-2016/
More informationAbstract. imedpub Journals Vol.3 No.2:27. Introduction
Research Article imedpub Journals http://www.imedpub.com/ Journal of Eye & Cataract Surgery DOI: 10.21767/2471-8300.100027 Intraoperative Biometry versus Conventional Methods for Predicting Intraocular
More informationTotal corneal astigmatism in older adults taking into account posterior corneal astigmatism by ray tracing
ARTICLE Total corneal astigmatism in older adults taking into account posterior corneal astigmatism by ray tracing Alvaro Rodríguez Ratón, MD 1 ; Javier Orbegozo Gárate, MD 1 ; Iñaki Basterra Barrenetxea,OD
More informationThe efficacy of Toric IOL in comparison to LRI in correcting pre-existing astigmatism in phacoemulsification
Original Research Article The efficacy of Toric IOL in comparison to LRI in correcting pre-existing astigmatism in phacoemulsification Parul Singh 1, Ruchika Agarwal 2*, Sanjeev Rohatgi 2, Malini Vohra
More informationComparison of Toric Foldable Iris-Fixated Phakic Intraocular Lens Implantation and Limbal Relaxing Incisions for Moderate-to-High Myopic Astigmatism
Original Article Yonsei Med J 216 Nov;57(6):1475-1481 pissn: 513-5796 eissn: 1976-2437 Comparison of Toric Foldable Iris-Fixated Phakic Intraocular Lens Implantation and Limbal Relaxing Incisions for Moderate-to-High
More informationCircular Keratotomy to Reduce Astigmatism and Improve Vision in Stage I and II Keratoconus
Circular Keratotomy to Reduce Astigmatism and Improve Vision in Stage I and II Keratoconus Jorg H. Krumeich, MD; Guy M. Kezirian, MD, FACS ABSTRACT PURPOSE: To report the use of circular keratotomy in
More informationManagement of astigmatism at the time of cataract or refractive lens surgery has evolved to include arcuate keratotomy and toric
Management of Astigmatism with the LENSAR Laser System with Streamline Mark Packer Mark Packer MD Consulting, Inc., Boulder, CO, US DOI: https://doi.org/10.17925/usor.2017.12.99 Management of astigmatism
More informationAXsys Study Data and Press Release Reference
Clinically Tested to be the World s Most Accurate Toric Marking Device Takayuki Akahoshi, MD Tokyo Japan Ophthalmologist Anterior Segment I WORKED WITH ASICO LLC TO DESIGN AN AXsys TM TORIC MARKING DEVICE
More informationStandard for Reporting Refractive Outcomes of Intraocular Lens Based Refractive Surgery
EDITORIAL Standard for Reporting Refractive Outcomes of Intraocular Lens Based Refractive Surgery Dan Z. Reinstein, MD, MA(Cantab), FRCSC; Timothy J. Archer, MA(Oxon), DipCompSci(Cantab); Sathish Srinivasan,
More informationTHE CHALLENGES CORNEAL IRREGULARITIES POST-LASIK ECTASIA IS THIS A GOOD LASIK CANDIDATE? 3/5/2015. FITTING THE IRREGULAR CORNEA Challenges & Solutions
DISCLOSURE STATEMENT No disclosure statement. CORNEAL IRREGULARITIES Course Title: Lecturer: FITTING THE IRREGULAR CORNEA Challenges & Solutions Phyllis Rakow, COMT, NCLM, FCLSA(H) Keratoconus Pseudokeratoconus
More informationPerioperative Modulating Factors on Astigmatism in Sutured Cataract Surgery
접수번호 : 2008-114 Korean Journal of Ophthalmology 2009;23:240-248 ISSN : 1011-8942 DOI : 10.3341/kjo.2009.23.4.240 Perioperative Modulating Factors on Astigmatism in Sutured Cataract Surgery Yang Kyeung
More informationPOST-OPERATIVE ASTIGMATISM AFTER SICS AND PHACOEMULSIFICATION.
4 POST-OPERATIVE ASTIGMATISM AFTER SICS AND PHACOEMULSIFICATION. Dr.Vijay Damor, Dr.Anupama Mahant, Department of ophthalmology,amc MET Medical college. Ahmedabad pin 380008 Abstract : Background: Astigmatism
More informationA R Sebai Sarhan, Harminder S Dua, Michelle Beach
Br J Ophthalmol 2000;84:837 841 837 Division of Ophthalmology and Visual Sciences, University of Nottingham, University Hospital, Queen s Medical Centre, Nottingham NG7 2UH A R S Sarhan H S Dua M Beach
More informationPostoperative Astigmatic Outcomes Based on the Haptic Axis of Intraocular Lenses Inserted in Cataract Surgery
pissn: 1011-8942 eissn: 2092-9382 Korean J Ophthalmol 2011;25(1):22-28 DOI: 10.3341/kjo.2011.25.1.22 Original Article Postoperative Astigmatic Outcomes Based on the Haptic Axis of Intraocular Lenses Inserted
More informationOver the last decade, a vast improvement on intraocular
REVIEW Posterior Astigmatism: Considerations for Cataract Refractive Surgery Planning Milton S. Yogi, MD, MBA1 Bruna V. Ventura, MD, PhD2 Eliane M. Nakano, MD3 1 Head, Cataract Department, Beneficência
More informationNew method of quantifying corneal topographic astigmatism that corresponds with manifest refractive cylinder
ARTICLE New method of quantifying corneal topographic astigmatism that corresponds with manifest refractive cylinder Noel Alpins, FRANZCO, FRCOphth, FACS, James K.Y. Ong, BOptom, Dr.rer.nat, George Stamatelatos,
More informationDr Noel Alpins AM Digest of Personal and Professional biography
Dr Noel Alpins AM Digest of Personal and Professional biography Work Address: 7 Chesterville Road Cheltenham 3192 Dr Noel Alpins AM has been specialising in Cataract and Refractive Surgery since founding
More informationWe are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists. International authors and editors
We are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists 3,700 108,500 1.7 M Open access books available International authors and editors Downloads Our
More informationFemtosecond laser-assisted astigmatic keratotomy: a review
Chang Eye and Vision (2018) 5:6 https://doi.org/10.1186/s40662-018-0099-9 REVIEW Open Access Femtosecond laser-assisted astigmatic keratotomy: a review John S. M. Chang Abstract Background: Astigmatic
More informationCHANGE ON THE HORIZONTAL AND VERTICAL MERIDIANS OF THE CORNEA AFTER CATARACT SURGERY*
15 Merriam Final 11/9/01 11:22 AM Page 187 CHANGE ON THE HORIZONTAL AND VERTICAL MERIDIANS OF THE CORNEA AFTER CATARACT SURGERY* BY John C. Merriam, MD, Lei Zheng, MD (BY INVITATION), Joanna Urbanowicz,
More informationWhite Paper. Astigmatism Management With Toric IOLs The Importance of Rotational Stability After IOL Implantation. Xiaolin Gu, M.D., PhD.
White Paper Astigmatism Management With Toric IOLs The Importance of Rotational Stability After IOL Implantation Xiaolin Gu, M.D., PhD. Introduction Cataracts, or clouding of the crystalline lens, are
More informationNovel Microscope Mounted Digital Keratoscope for Intra-Operative Toric IOL Alignment
Cronicon OPEN ACCESS EC OPHTHALMOLOGY Research Article Novel Microscope Mounted Digital Keratoscope for Intra-Operative Toric IOL Alignment Sviatlana M Ilyina 1 *, Siarhei M Lohash 2 and Alex Artsyukhovich
More informationComparison of the Astigmatic Power of Toric Intraocular Lenses Using Three Toric Calculators
Original Article http://dx.doi.org/10.3349/ymj.2015.56.4.1097 pissn: 0513-5796, eissn: 1976-2437 Yonsei Med J 56(4):1097-1105, 2015 Comparison of the Astigmatic Power of Toric Intraocular Lenses Using
More informationORIGINAL ARTICLE. Primary Topography-Guided LASIK: Treating Manifest Refractive Astigmatism Versus Topography-Measured Anterior Corneal Astigmatism
ORIGINAL ARTICLE Primary Topography-Guided LASIK: Treating Manifest Refractive Astigmatism Versus Topography-Measured Anterior Corneal Astigmatism Avi Wallerstein, MD, FRCSC; Mathieu Gauvin, BEng, PhD;
More informationClinical outcomes of Transepithelial photorefractive keratectomy to treat low to moderate myopic astigmatism
Xi et al. BMC Ophthalmology (2018) 18:115 https://doi.org/10.1186/s12886-018-0775-5 RESEARCH ARTICLE Clinical outcomes of Transepithelial photorefractive keratectomy to treat low to moderate myopic astigmatism
More informationPredicting of Uncorrected Astigmatism from Decimal Visual Acuity in Spherical Equivalent
Journal of the Optical Society of Korea Vol. 17, No. 2, April 2013, pp. 219-223 DOI: http://dx.doi.org/10.3807/josk.2013.17.2.219 Predicting of Uncorrected Astigmatism from Decimal Visual Acuity in Spherical
More informationFull-Thickness Astigmatic Keratotomy Combined With Small-Incision Lenticule Extraction to Treat High-Level and Mixed Astigmatism
CLINICAL SCIENCE Full-Thickness Astigmatic Keratotomy Combined With Small-Incision Lenticule Extraction to Treat High-Level and Mixed Astigmatism Bu Ki Kim, MD, MS,* Su Joung Mun, MD, PhD,* Dae Gyu Lee,
More informationPhacoemulsification: The first 50 Cases
Phacoemulsification: The first 5 Cases Aneeq Ullah Baig Mirza*, Samina Jehangir**, Wasif Mohy-ud-din Kadri** * Department of Ophthalmology Islamic International Medical College and Railway Hospital Rawalpindi.
More informationOrthokeratology (Ortho-K), or corneal refractive therapy, is. Toric Double Tear Reservoir Contact Lens in Orthokeratology for Astigmatism ARTICLE
ARTICLE Toric Double Tear Reservoir Contact Lens in Orthokeratology for Astigmatism Jaume Pauné, M.Sc., Genís Cardona, Ph.D., and Lluïsa Quevedo, Ph.D. Objectives: This study aimed at assessing the performance
More informationIrregular Astigmatism Diagnosis And Treatment
Irregular Astigmatism Diagnosis And Treatment 1 / 5 2 / 5 3 / 5 Irregular Astigmatism Diagnosis And Treatment Irregular Astigmatism: Diagnosis and Treatment. Ming Wang, ed., Thorofare, NJ: Slack Inc.;
More informationProspective study of toric IOL outcomes based on the Lenstar LS 900 W dual zone automated keratometer
Gundersen and Potvin BMC Ophthalmology 2012, 12:21 RESEARCH ARTICLE Open Access Prospective study of toric IOL outcomes based on the Lenstar LS 900 W dual zone automated keratometer Kjell Gunnar Gundersen
More informationRichard N. McNeely 1,2, Salissou Moutari 3, Eric Pazo 1,2 and Jonathan E. Moore 1,2*
McNeely et al. Eye and Vision (2018) 5:7 https://doi.org/10.1186/s40662-018-0103-4 RESEARCH Investigating the impact of preoperative corneal astigmatism orientation on the postoperative spherical equivalent
More informationResults of Intraoperative Manual Cyclotorsion Compensation for Myopic Astigmatism in Patients Undergoing Small Incision Lenticule Extraction (SMILE)
ORIGINAL ARTICLE Results of Intraoperative Manual Cyclotorsion Compensation for Myopic Astigmatism in Patients Undergoing Small Incision Lenticule Extraction (SMILE) Sri Ganesh, MS, DNB; Sheetal Brar,
More informationDevelopment of a program for toric intraocular lens calculation. considering posterior corneal astigmatism, incisioninduced
DOI 10.1007/s00417-016-3446-3 CATARACT Development of a program for toric intraocular lens calculation considering posterior corneal astigmatism, incision-induced posterior corneal astigmatism, and effective
More informationOPTOMETRY. An analysis of the astigmatic changes induced by accelerated o rt ho ke ratolog y I ORIGINALPAPER 1
OPTOMETRY I ORIGINALPAPER 1 An analysis of the astigmatic changes induced by accelerated o rt ho ke ratolog y Clin Exp Optom ; 85: 5: 84-93 John Mountford* DipAppSc FAAO FVCO FCLS Konrad Pesudovst PhD
More informationSTUDY OF ASTIGMATISM IN SMALL INCISSION CATARACT SURGERY BETWEEN TEMPORAL AND SUPERIOR INCISSIONS K. J. N. Sivacharan 1, G.
STUDY OF ASTIGMATISM IN SMALL INCISSION CATARACT SURGERY BETWEEN TEMPORAL AND SUPERIOR INCISSIONS K. J. N. Sivacharan 1, G. Hanumantharao 2 HOW TO CITE THIS ARTICLE: K. J. N. Sivacharan, G. Hanumantharao.
More informationEffect of Pupil Size on Uncorrected Visual Acuity in Pseudophakic Eyes With Astigmatism
ORIGINAL ARTICLE Effect of Pupil Size on Uncorrected Visual Acuity in Pseudophakic Eyes With Astigmatism Kazuhiro Watanabe, MD; Kazuno Negishi, MD; Murat Dogru, MD; Takefumi Yamaguchi, MD; Hidemasa Torii,
More informationClinical Study Effect of Pupil Size on Optical Quality Parameters in Astigmatic Eyes Using a Double-Pass Instrument
BioMed Research International Volume 2013, Article ID 124327, 6 pages http://dx.doi.org/1155/2013/124327 Clinical Study Effect of Pupil Size on Optical Quality Parameters in Astigmatic Eyes Using a Double-Pass
More informationDiagnosis and Management of Astigmatism
Diagnosis and Management of Astigmatism Ray George Diagnosis and Management of Astigmatism "This page is Intentionally Left Blank" Diagnosis and Management of Astigmatism Edited by Ray George Published
More informationOPTOMETRY INVITED REVIEW. A review of astigmatism and its possible genesis
C L I N I C A L A N D E X P E R I M E N T A L OPTOMETRY INVITED REVIEW A review of astigmatism and its possible genesis Clin Exp Optom 2007; 90: 1: 5 19 Scott A Read PhD Michael J Collins PhD Leo G Carney
More informationResearch conducted over the past 15 years has yielded a
Visual Psychophysics and Physiological Optics Longitudinal Change and Stability of Refractive, Keratometric, and Internal Astigmatism in Childhood Erin M. Harvey, 1,2 Joseph M. Miller, 1 3 J. Daniel Twelker,
More informationCorrecting Your Vision: Advice and Opinions from an Eye Surgeon Health Radio April 17, 2007 Mark Walker, M.D. Introduction
Correcting Your Vision: Advice and Opinions from an Eye Surgeon Health Radio April 17, 2007 Mark Walker, M.D. Please remember the opinions expressed on Patient Power are not necessarily the views of Health
More informationRefractive, anterior corneal and internal astigmatism in the pseudophakic eye
Refractive, anterior corneal and internal astigmatism in the pseudophakic eye Jesper F. Bregnhøj, 1,2 Pourang Mataji 1,2 and Kristian Næser 1,2 1 Department of Ophthalmology, Aarhus University Hospital,
More informationAstigmatism in Children: Changes in Axis and Amount from Birth to Six Years
Astigmatism in Children: Changes in Axis and Amount from Birth to Six Years Jane Gwiazda, Mitchell Scheiman,* Indra Mohindra, and Richard Held Noncycloplegic refractions of, children aged - years revealed
More information1. Introduction. Correspondence should be addressed to Edmund Arthur; arthur
Hindawi Publishing Corporation Journal of Ophthalmology Volume, Article ID 989, 7 pages http://dx.doi.org/.//989 Clinical Study Postoperative Corneal and Surgically Induced Astigmatism following Superior
More informationAstigmatism: analysis and synthesis of the astigmatic ametropia
http://eoftalmo.org.br OPINION OF SPECIALISTS Astigmatism: analysis and synthesis of the astigmatic ametropia Astigmatismo: análise e síntese da ametropia astigmática Analysis and synthesis of the astigmatic
More informationAstigmatismamongotherRefractiveErrorsinChildrenofSouthernSriLanka. Astigmatism among other Refractive Errors in Children of Southern Sri Lanka
: F Diseases Volume 15 Issue 1 Version 1.0 Year 2015 Type: Double Blind Peer Reviewed International Research Journal Publisher: Global Journals Inc. (USA) Online ISSN: 2249-4618 & Print ISSN: 0975-5888
More informationbalt5/zov-opx/zov-opx/zov01005/zov a washingd S 12 10/4/05 14:54 Art: OPX Input-nlm ORIGINAL ARTICLE
1040-5488/05/8210-0001/0 VOL. 82, NO. 10, PP. 1 1 OPTOMETRY AND VISION SCIENCE Copyright 2005 American Academy of Optometry ORIGINAL ARTICLE Progressive Powered Lenses: the Minkwitz Theorem JAMES E. SHEEDY,
More informationAstigmatism: Aberration or ametropia?
http://eoftalmo.org.br OPINION OF SPECIALISTS Astigmatism: Aberration or ametropia? Astigmatismo: Aberração ou Ametropia? Astigmatismo: Aberración o ametropía? Sidney Julio Faria e Sousa - Faculdade de
More informationHandheld Shack Hartmann Wavefront Sensor. Jim Schwiegerling, Ph.D. Department of Ophthalmology and Optical Sciences The University of Arizona
Handheld Shack Hartmann Wavefront Sensor Jim Schwiegerling, Ph.D. Department of Ophthalmology and Optical Sciences The University of Arizona COLLABORATORS Erin M. Harvey, PhD Velma Dobson, PhD Joseph M.
More informationORIGINAL ARTICLE. Corneal and Refractive Error Astigmatism in Singaporean Schoolchildren: a Vector-Based Javal s Rule
1040-5488/01/7812-0881/0 VOL. 78, NO. 12, PP. 881 887 OPTOMETRY AND VISION SCIENCE Copyright 2001 American Academy of Optometry ORIGINAL ARTICLE Corneal and Refractive Error Astigmatism in Singaporean
More information620 Rejwrts Investigative Ophthalmology
Rejwrts Investigative Ophthalmology August D. E.: Retinal dystrophy in the rat a pigment epithelial disease, INVEST. OPHTHALMOL. :,. Color vision: blue deficiencies in? ANTHONY J. ADAMS,* RICHARD BAL-
More informationWe are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists. International authors and editors
We are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists 3,500 108,000 1.7 M Open access books available International authors and editors Downloads Our
More informationCA-800 Tear Module. Rick Gaudenti. Product Manager, Refraction Mar 2017
CA-800 Tear Module Rick Gaudenti Product Manager, Refraction Mar 2017 Meibomian Gland Imaging Meibomian Gland [MEIB] Viewing Meibomian Images are displayed in the center of the screen Two types of an adjustable
More informationMulticolor Scan Laser Photocoagulator MC-500 Vixi
Multicolor Scan Laser Photocoagulator MC-500 Vixi MC-500 The Versatile Laser Photocoagulator Selectable configuration of laser colors and delivery units Multiple scan patterns Enhanced usability LPM (Low
More informationLitho. Taking care of people, our masterpieces. Surgical Laser System. Surgery
Taking care of people, our masterpieces Litho Surgical Laser System This brochure is not intended for the U.S. market. Certain Intended Uses/Configurations/Models/Accessories are not cleared for U.S. Surgery
More informationA REVIEW OF ASTIGMATISM: A REFRACTIVE ERROR CORRECTABLE BY CYLINDRICAL GLASSES
Shah et al Journal of Drug Delivery & Therapeutics. 2015; 5(2):29-36 29 Available online on 15.03.2015 at http://jddtonline.info Journal of Drug Delivery and Therapeutics Open access to Pharmaceutical
More informationThe eyes of neonates of all species studied have rather. Severe Astigmatic Blur Does Not Interfere with Spectacle Lens Compensation
A R T I C L E S Severe Astigmatic Blur Does Not Interfere with Spectacle Lens Compensation Rhondalyn C. McLean and Josh Wallman PURPOSE. Whether either natural emmetropization or compensation for imposed
More informationLin Liu, Jun Zou *, Hui Huang, Jian-guo Yang and Shao-rong Chen
Liu et al. Diagnostic Pathology 2012, 7:55 RESEARCH Open Access The influence of corneal astigmatism on retinal nerve fiber layer thickness and optic nerve head parameter measurements by spectral-domain
More informationAnalysis of WFS Measurements from first half of 2004
Analysis of WFS Measurements from first half of 24 (Report4) Graham Cox August 19, 24 1 Abstract Described in this report is the results of wavefront sensor measurements taken during the first seven months
More informationAstigmatism in infant monkeys reared with cylindrical lenses
Vision Research 43 (2003) 2721 2739 www.elsevier.com/locate/visres Astigmatism in infant monkeys reared with cylindrical lenses Chea-su Kee, Li-Fang Hung, Ying Qiao, Earl L. Smith III * College of Optometry,
More informationPHGN 480 Laser Physics Lab 4: HeNe resonator mode properties 1. Observation of higher-order modes:
PHGN 480 Laser Physics Lab 4: HeNe resonator mode properties Due Thursday, 2 Nov 2017 For this lab, you will explore the properties of the working HeNe laser. 1. Observation of higher-order modes: Realign
More informationOpen loop tracking of radio occultation signals in the lower troposphere
Open loop tracking of radio occultation signals in the lower troposphere S. Sokolovskiy University Corporation for Atmospheric Research Boulder, CO Refractivity profiles used for simulations (1-3) high
More informationOnset and Progression of With-the-Rule Astigmatism in Children with Infantile Nystagmus Syndrome
Visual Psychophysics and Physiological Optics Onset and Progression of With-the-Rule Astigmatism in Children with Infantile Nystagmus Syndrome Jingyun Wang, Lauren M. Wyatt, Joost Felius,, David R. Stager,
More informationCBT 70J Constant Beamwidth Technology
CBT 7J Constant Beamwidth Technology Two-Way Line Array Column with Asymmetrical Vertical Coverage Key Features: Asymmetrical vertical coverage sends more sound toward far area of room to make front-to-back
More informationDra. Mercè Morral. Núm. col legiada: Oftalmòloga especialitzada en còrnia i cirurgia refractiva de l Institut de Microcirurgia Ocular.
Dra. Mercè Morral Departament de Còrnia i Cirurgia Refractiva de l IMO, Institut de Microcirurgia Ocular Núm. col legiada: 36.914 Currículum Perfil professional Oftalmòloga especialitzada en còrnia i cirurgia
More informationHow to Chose an Ideal High Definition Endoscopic Camera System
How to Chose an Ideal High Definition Endoscopic Camera System Telescope Laparoscopy (from Greek lapara, "flank or loin", and skopein, "to see, view or examine") is an operation performed within the abdomen
More informationAstigmatism is a common refractive error 1 and an important. The Changing Profile of Astigmatism in Childhood: The NICER Study
Clinical and Epidemiologic Research The Changing Profile of Astigmatism in Childhood: The NICER Study Lisa O Donoghue, Karen M. Breslin, and Kathryn J. Saunders School of Biomedical Sciences, University
More information1. Standard Equipment Subjective Eye Tester Name of Parts Details of Auxiliary Lenses Measuring Performance...
Notification Dear Users, Thank you for your purchase of R 2500 Refractor. Please take time to read our user s manual carefully before use. This guarantees you to make full use of this unit and prolongs
More informationMC-500 Vixi MC-500. Multicolor Scan Laser Photocoagulator. Multicolor Laser Photocoagulator US EDITION
Multicolor Scan Laser Photocoagulator MC-500 Vixi MC-500 Multicolor Laser Photocoagulator US EDITION MC-500 / MC-500 The Versatile Laser Photocoagulator The versatility of the MC-500 Vixi / MC-500 speaks
More informationINSTRUMENT CATHODE-RAY TUBE
Instrument cathode-ray tube D14-363GY/123 INSTRUMENT CATHODE-RAY TUBE mono accelerator 14 cm diagonal rectangular flat face internal graticule low power quick heating cathode high brightness, long-life
More informationSimulation of Micro Blanking Process of Square Hole with Fillet Based on DEFORM-3D
3rd International Conference on Material, Mechanical and Manufacturing Engineering (IC3ME 2015) Simulation of Micro Blanking Process of Square Hole with Fillet Based on DEFORM-3D Shining Zhou 1,a, Xiaolong
More informationMulticolor Scan Laser Photocoagulator MC-500 Vixi. Multicolor Laser PhotocoagulatorMC-500
Multicolor Scan Laser Photocoagulator MC-500 Vixi Multicolor Laser PhotocoagulatorMC-500 MC-500 / MC-500 The Versatile Laser Photocoagulator The versatility of the MC-500 Vixi / MC-500 speaks for itself.
More informationLaneMap Guide Strike Zone at Sunset Station - Las Vegas, NV 29 April 2013 KEGEL
LaneMap Guide Strike Zone at Sunset Station - Las Vegas, NV 29 April 2013 KEGEL 2012 KEGEL Introduction Kegel is pleased to provide you with this revolutionary LaneMap Guide. This guide is an assessment
More informationWe are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists. International authors and editors
We are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists 4,000 116,000 120M Open access books available International authors and editors Downloads Our
More informationDIGITAL METAL DM P2500 YOUR FAST TRACK TO HIGH-QUALITY 3D METAL PARTS DM P2500
DIGITAL METAL DM P2500 YOUR FAST TRACK TO HIGH-QUALITY 3D METAL PARTS DM P2500 FAST AND FURIOUSLY EFFECTIVE The DM P2500 is a sturdy workhorse where no efforts have been spared to make it as accurate as
More informationAhigh prevalence of astigmatism has been documented
Clinical and Epidemiologic Research Prevalence of Corneal Astigmatism in Tohono O odham Native American Children 6 Months to 8 Years of Age Erin M. Harvey, 1,2 Velma Dobson, 1,3 Joseph M. Miller, 1,2,4
More informationA Performance Ranking of. DBK Associates and Labs Bloomington, IN (AES Paper Given Nov. 2010)
A Performance Ranking of Seven Different Types of Loudspeaker Line Arrays D. B. (Don) Keele, Jr. DBK Associates and Labs Bloomington, IN 47408 www.dbkeele.com (AES Paper Given Nov. 2010) Nov. 4, 2010 AES
More information