accommodative arching
DESCRIPTION
Accommodative Arching. Eyeonics Briefing 2 February 2005 Kevin L. Waltz, OD, MD Eye Surgeons of Indiana Indianapolis, IN. Outline of Briefing. Background Measurement limitations Historical assumptions Fortuitous patient Archeological evidence Theory fit with known data. - PowerPoint PPT PresentationTRANSCRIPT
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Accommodative ArchingAccommodative Arching
Eyeonics BriefingEyeonics Briefing2 February 20052 February 2005
Kevin L. Waltz, OD, MDKevin L. Waltz, OD, MDEye Surgeons of IndianaEye Surgeons of Indiana
Indianapolis, INIndianapolis, IN
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Outline of BriefingOutline of Briefing
BackgroundBackground
Measurement limitationsMeasurement limitations
Historical assumptionsHistorical assumptions
Fortuitous patientFortuitous patient
Archeological evidenceArcheological evidence
Theory fit with known data Theory fit with known data
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Background for AA TheoryBackground for AA Theory
KLW’s interest in refractive lens surgeryKLW’s interest in refractive lens surgery
Tracey experience since summer 2002Tracey experience since summer 2002
i i Trace experience since fall 2003Trace experience since fall 2003
Experience with capsular effects on IOL’sExperience with capsular effects on IOL’s
KLW’s frustration with initial AT-45 outcomesKLW’s frustration with initial AT-45 outcomes
Extensive wavefront testing of distance and Extensive wavefront testing of distance and
near vision with IOL’s, including AT-45 pts near vision with IOL’s, including AT-45 pts
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Array Eye for Tracey ReviewArray Eye for Tracey Review
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Experience with Capsular/YAG Effects Experience with Capsular/YAG Effects on Multifocal Opticson Multifocal Optics
10 minutes10 minutes Pre-YAG Post-YAGPre-YAG Post-YAG 20/20 & J3 20/20 & J1 20/20 & J3 20/20 & J1
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Experience with Monofocal IOL’s Experience with Monofocal IOL’s “Pseuodaccommodation”“Pseuodaccommodation”
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Measurement LimitationsMeasurement Limitations
Original Tracey 64 sequential spotsOriginal Tracey 64 sequential spots
i i Trace Trace sequential 256 spotssequential 256 spots
Variable spot positioning on TraceyVariable spot positioning on Tracey
Tracey can readily measure wavefront at nearTracey can readily measure wavefront at near
Shack-Hartmann simultaneous spotsShack-Hartmann simultaneous spots
NIPEK OPD simultaneous topo and wavefrontNIPEK OPD simultaneous topo and wavefront
COAS direct imagingCOAS direct imaging
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Historical AssumptionsHistorical Assumptions
Near wavefront ignoredNear wavefront ignored
Near wavefront assumed to be the same Near wavefront assumed to be the same as distance with some amount of as distance with some amount of uniformly increased poweruniformly increased power
Reading glasses = accommodationReading glasses = accommodation
Low HOA @ distance = low HOA @ nearLow HOA @ distance = low HOA @ near
Low HOA @ near is good Low HOA @ near is good
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Zachary Waltz 13 yoZachary Waltz 13 yo
OD – 5 D accommodationOD – 5 D accommodation OD – No accommodationOD – No accommodation
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Successful College Student 19yoSuccessful College Student 19yo
OS – 5 D accommodationOS – 5 D accommodation OS – No accommodationOS – No accommodation
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Successful Medical Student Successful Medical Student S/P LASIK 23 yoS/P LASIK 23 yo
OD – 5 D accommodationOD – 5 D accommodation OD – No accommodationOD – No accommodation
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Fortuitous PatientFortuitous Patient
72 year old white male cataract pt72 year old white male cataract pt
Desired to be less dependent on glassesDesired to be less dependent on glasses
Uneventful cataract surgeryUneventful cataract surgery
PO: Little to no near vision and myopicPO: Little to no near vision and myopic
Repositioned IOL in bag at 7 weeks to Repositioned IOL in bag at 7 weeks to decrease myopia, rotated IOL 90°decrease myopia, rotated IOL 90°
Improved distance and near visionImproved distance and near vision
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Prior to IOL RotationPrior to IOL Rotation
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Accommodation with CrystalensAccommodation with CrystalensS/P IOL Rotation by 90S/P IOL Rotation by 90°°
Distance refractive mapDistance refractive map Near refractive Near refractive
mapmap
0.186 rms total error 0.464 rms total 0.186 rms total error 0.464 rms total
errror errror
0.69+0.36X0780.69+0.36X078 -2.37+0.92x008 -2.37+0.92x008
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Crystalens Accommodative ArchingCrystalens Accommodative Arching
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AA at a Different Meridian 8:46AA at a Different Meridian 8:46
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AA at a Different Meridian 8:47AA at a Different Meridian 8:47
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AA Relaxed 8:52AA Relaxed 8:52
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AA relaxed 8:53AA relaxed 8:53
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AA at Maximum 10 Diopters 8:54AA at Maximum 10 Diopters 8:54
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Archeologiccal EvidenceArcheologiccal Evidence
“The aberrations in some Tracey images are not “The aberrations in some Tracey images are not compatible with high quality vision.”compatible with high quality vision.”
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Archeologiccal EvidenceArcheologiccal Evidence
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Archeologiccal EvidenceArcheologiccal Evidence46 yo Optometrist46 yo Optometrist
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Phakic Patients have AAPhakic Patients have AA33 yo WF Preop Cataract33 yo WF Preop Cataract
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50 yo Optometrist Preop Cataract50 yo Optometrist Preop Cataract
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17 yo Son of Optometrist17 yo Son of Optometrist
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17 yo w/ 5 Diopters Stimulus17 yo w/ 5 Diopters Stimulus& 3.25 Diopters AA Response& 3.25 Diopters AA Response
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50 yo Optometrist Dilated PO #150 yo Optometrist Dilated PO #1
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50 yo Optometrist Dilated PO Week 350 yo Optometrist Dilated PO Week 3
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48 yo Prelex Preop Distance48 yo Prelex Preop Distance
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48 yo Prelex Preop Near48 yo Prelex Preop Near1.25 Diopters of “Accommodation”1.25 Diopters of “Accommodation”
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AA Theory Fit With Known DataAA Theory Fit With Known Data
Images are almost certainly realImages are almost certainly real
Axial movement of 0.3 mm needed for Axial movement of 0.3 mm needed for
10 D of AA flexing over 2mm diameter 10 D of AA flexing over 2mm diameter
Variations in Crystalens orientation Variations in Crystalens orientation relative to power axis in eye would relative to power axis in eye would create inconsistent measured near create inconsistent measured near vision in patientsvision in patients
Capsule effects might change with Capsule effects might change with timetime
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AA Theory Fit With Known DataAA Theory Fit With Known Data
Variations in IOL power with AA and Variations in IOL power with AA and emerging concept of neuroplasticity emerging concept of neuroplasticity could explain inconsistency in could explain inconsistency in
measured accommodation measured accommodation
vs vs
observed near visionobserved near vision