Laser Corneal Refractive Surgery to Correct Presbyopiavoi.opt.uh.edu › VOI › WavefrontCongress...
Transcript of Laser Corneal Refractive Surgery to Correct Presbyopiavoi.opt.uh.edu › VOI › WavefrontCongress...
Dimitri A Chernyak, PhDDirector of Research, AMO Inc.
February 24, 2007
Laser Corneal Refractive Surgeryto Correct Presbyopia
Laser Corneal Refractive Surgeryto Correct Presbyopia
The problem of Presbyopia
• Age-related loss of accommodation– Lose near visual acuity– 20s: Loss starts– Early 40s: Functional vision affected– Over 50: 100% of population presbyopic
• Conflicting theories– Hardening of lens/capsule (accepted)– Continual lens growth (disputed)– Weakening of ciliary muscle (unclear)
What can we do?• Corrections
– Glasses (Bi-, Trifocals, Progressives)– Contact lenses (multifocal/monovision)
• Ocular surface surgical procedures– Corneal procedures (change optics)
• Conductive Keratoplasty• Corneal ablation
– Monovision ablations– Multifocal ablations
– Scleral procedures (improve accommodation)• Laser Presbyopia Reversal (Surgilight)• Scleral expansion implants
• Intra-ocular procedures– Lens Exchange
• Multifocal IOLs• Accommodating IOLs
Inva
sive
nes
s
Outline of the Presentation
• Incidence and prevalence of Presbyopia• Clinical objectives for each indication• LVC scientific approaches to treatment of Presbyopia• Results to date• Issues and concerns• Ongoing research activities
Myopia23%
Hyperopia4%
Presbyopia14%
Myo + Presby5%
Hyper + Presby12%
No Correction42%
Vision Correction – World Wide Prevalence
Market Scope data
Outline of the Presentation
• Incidence and prevalence of Presbyopia• Clinical objectives for each indication• LVC scientific approaches to treatment of Presbyopia• Results to date• Issues and concerns• Ongoing research activities
Medicine bottle’s fine print20/300.15 logMAR
J1+4 638 EeaHXO
Map’s street names20/400.30 logMAR
J15 638 EeaHXO
Wall Street J. stock & fineprintMedicine bottle textPhone book
20//550.45logMAR
J36 638 EeaHXO
Wall Street Journal text20/700.55logMAR
J58 638 EeaHXO
Wall Street Journal Subtitles20/900.66 logMAR
J710 638 EeaHXO
20/1250.80 logMAR
J1014 638 EeaHXO
Real lifereading materials
Visual angleif hold print at 40cm
RosenbaumJaeger
Actual print size(MS Word-Arial)
*J2 is omitted since it is only 4% larger than J1 (20/41 instead of 20/40)
Clinical Objectives
• Original Goal: 20/25or betteruncorrected monoculardistance visionAND simultaneouslyJ3 or better uncorrectedmonocular near vision(“the box”)
• Myopia Patients may not be satisfied with 20/25distance vision. 20/20 & J3 might be more appropriatetarget
Unco
rrec
ted N
ear
Vis
ual
Acu
ity
Uncorrected Distance Visual Acuity
20/10 20/20 20/32 20/50 20/80 20/125
J2
J4
J6
J8
J10
J1+
Clinical Objectives
• Safety– BCDVA less then 2 lines loss
– No debilitating visual complaints
– Normal range of contrast sensitivity for the age group
• Efficacy– Good simultaneous near & distance visual acuity (the “box”)
– Subjective satisfaction with quality of vision
– Reduced or eliminated spectacle dependence
Outline of the Presentation
• Incidence and prevalence of Presbyopia• Clinical objectives for each indication• LVC scientific approaches to treatment of Presbyopia• Results to date• Issues and concerns• Ongoing research activities• Competition and IP
LVC Approach: Multifocality• Inadvertent induction of multifocality
– Early hyperopic treatments– Hyperopic/myopic treatment, overcorrection, opposite retreatment
• Mimicking glasses/contacts on the eye
• Systematic Research– Building a theoretical eye model– Determining an optimal shape for long depth of field– Simulating optical performance– Transferring theoretical model into real world
• Modify optics for long depth of focusDistance
Multifocal
Monofocal
Near
What is “Multifocality”?
The paths of light through the eye
Theory and practice
PreOp PostOp
Research Methodology• Optical modeling
– Using theoretical eye model determine pupil dynamics effects– Determining an optimal shape for long depth of field*– Simulating optical performance– Transferring theoretical model into real world
• PreVue lens studies• AO research in collaboration with Murcia University• Clinical Studies
– Intended vs. Achieved (Topography, wavefront, acuity,depth of focus, contrast)
– Patient satisfaction
*G. Dai, “Optical surface optimization for correction of presbyopia”, Applied Optics, Vol. 45 No. 17, 10 June 2006.
Simulated outcomes: Without correction
Distance Intermediate Near
Simulated outcomes: With correction
Distance Intermediate Near
PreVue Lens Study: Design Motivation
• Difficult to separate possible sources of “error”:– Design
– Treatment
– Biomechanical effects and healing
– Cortical effects (learning)
• Scleral shells (large contact lenses) for testing ofablation profiles without healing or learning effects
• Reusable subjects!!!
Visual Performance Evaluation
• Wavefront measurement• Pupil dynamics• Distance Visual Acuities (logMAR)
– High contrast (photopic & mesopic)– Low contrast
• Near Visual Performance
• Contrast performance– Low contrast Visual Acuities (logMAR)– Sine wave contrast sensitivity (logCS)– Small letter contrast sensitivity (logCS)
Binocular performance– Stereopsis– Worth 4 dot
• Subjective feedback– 30 mins near tasks– Binocular questionnaire
• Scale from 0 (perfect) to 10 (totally unacceptable)• Visual performance
(distance, intermediate, near, multi-tasking etc)• Visual symptoms
(ghost image, glare, halo etc.)• Satisfaction
Depth of Field (XY OD)
-0.20
0.00
0.20
0.40
0.60
0.80
1.00
4.00 3.00 2.50 2.00 1.50 1.00
Accom. Demand (D)
DC
NV
A (l
ogM
AR
)
Base line
R
B
H2
T
G1.3
Outline of the Presentation
• Incidence and prevalence of Presbyopia• Clinical objectives for each indication• LVC scientific approaches to treatment of Presbyopia• Results to date• Issues and concerns• Ongoing research activities
WaveScan Confirmation of Multifocality
Hyperopic Presbyopia(Pre-op)
Multifocal(Post-op)
-0.10
0.10
0.30
0.50
0.70
0.90
1.10
1.30
-0.20 -0.10 0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90
Pre-op (n=16 Subjects)12 M (n= 16 Subjects)
20/25 or better
J3 o
r bet
ter
100% achieve 20/25 distance and J3 near 88% achieve 20/25 and J1
Hyperopic Presbyopia Clinical TrialUncorrected Distance and Near Vision at 12 Months with Bilateral Multifocal Eyes
Canadian Study: 82 eyes, 4 sites, 47 to 68 yrs, S: +0.5 3.5D, C: 0.0 1.5D
Hyperopic Presbyopia Clinical TrialUS Clinical Study Status
• Multifocal Non-Dominant Eye
• Database locked, case reports received
• Outcomes similar to Canadian study
• Expand US study to binocular multifocal treatments
• Remove contact lens portion of the US study
Uncorrected Distance Vision
0
65
0
95
55
100
0102030405060708090
100
% Eyes
20/20 or better 20/25 or better 20/40 or better
Monocular Uncorrected Distance Visionin Multifocal Eyes
(n=20)
Pre-Op
6 Months
0
70
0
95
70
100
0102030405060708090
100
% Eyes
20/20 or better 20/25 or better 20/40 or better
Monocular Uncorrected Distance Visionin Monofocal Eyes
(n=20)
Pre-Op
6 Months
0
100
20
100
80
100
0102030405060708090
100
% Subjects
20/20 or better 20/25 or better 20/40 or better
Binocular Uncorrected Distance Vision(n=20)
Pre-Op
6 Months
Satisfaction with Distance Vision
58
70
11 10
32
20
0
20
40
60
80
100
% Subjects
Satisfied/VerySatisfied
Not Sure Somewhat/VeryDissatisfied
Questionnaire Results for Both Eyes at Distance
Pre-Op (w/ correction)
6M (w/o correction)
Satisfaction with Near Vision
6065
2015
20 20
0
20
40
60
80
100
% Subjects
Satisfied/VerySatisfied
Not Sure Somewhat/VeryDissatisfied
Questionnaire Results for Both Eyes at Near
Pre-Op (w/ correction)
6M (w/o correction)
Uncorrected Distance and Near Vision at 6 Months in Monofocal Eyes
(n=20 Eyes)
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
-0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
UCVA
UC
NVA Pre-Op
6 Months
70% (14/20) eyes are J3 or better50% eyes are J1 or better
Uncorrected Distance and Near Vision at 6 Months in Multifocal Eyes
(n=20 Eyes)
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
-0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6
UCVA
UC
NVA Pre-Op
6 Months
95% (19/20) eyes are J3 or better90% eyes are J1 or better
Binocular Uncorrected Distance and Near Vision at 6 Months
(n=20 Subjects)
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
-0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6
UCVA
UC
NVA Pre-Op
6 Months
100% of patients at 6M are 20/20 J3.
Binocular Best Corrected Distance and Distance Corrected Near Vision at 6 Months
(n=20 Eyes)
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
-0.25 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1
BSCVA
DC
NVA Pre-Op
6 Months
100% of patients at 6M are 20/20 J3.95% are 20/20 and J1
Outline of the Presentation
• Incidence and prevalence of Presbyopia• Clinical objectives for each indication• LVC scientific approaches to treatment of Presbyopia• Results to date• Issues and concerns• Ongoing research activities• Competition and IP
Current issues
• Research– Access to Adaptive Optics technology for testing shapes
• Commercial use (outside of USA)– Patient selection criteria
– Managing expectations
– Slower than regular CustomVue visual recovery
– Monocular vs. binocular treatments
• Other indications– Myopes and emmetropes have higher visual
demands than hyperopes
Outline of the Presentation
• Incidence and prevalence of Presbyopia• Clinical objectives for each indication• LVC scientific approaches to treatment of Presbyopia• Results to date• Issues and concerns• Ongoing research activities
Ongoing Research Activities
• Refinements in shape design based onOptical modeling, Clinical trials, and AdaptiveOptics experiments
• Research into combination treatmentmodalities IOL+LVC for monofocal and multi-focal IOLs
Questions/Comments?