STATISTICS
iLASIK – January 2014 to Present
PRK – January 2014 to Present
iLASIK UCVA at 3 months
iLASIK UCVA at 12 months
PRK UCVA at 3 months
PRK UCVA at 12 months
Global Comparison
(iLASIK, 3 months post-op)
Parameter
User
Reference
+0.01 ± 0.09
+0.02 ± 0.14
82 %
70.79 %
Chi2 p=0.0019
CDVA gain of ≥ 1 Line
13.57 %
12.43 %
Chi2 p=0.7041
CDVA loss of ≥ 1 Line
2.71 %
18.08 %
Chi2 p<0.0001
-0.19 ± 0.38
-0.16 ± 0.42
SE within 0.5D of emmetropia
86.27 %
85.39 %
Chi2 p=0.7734
SE within 1.0D of emmetropia
96.95 %
96.63 %
Chi2 p=0.835
+0.17 ± 0.24
+0.26 ± 0.29
94.84 %
89.33 %
UDVA mean ± SD in LogMAR
UDVA ≥ 20/20
Red/Green = Significantly worse/better outcome
Significance
U-test p=0.8411
Results
SE mean ± SD in D (aim=emmetropia)
CYL mean ± SD in D (absolute)
CYL ≤ 0.5D
U-test p=0.1328
U-test p=0.0009
Chi2 p=0.0123
Global Comparison
(iLASIK, 3 months post-op)
For the year 2013, prior to
obtaining the iDesign.
Parameter
User
Reference
+0.01 ± 0.1
+0.00 ± 0.14
UDVA ≥ 20/20
82.89 %
82.81 %
Chi2 p=0.9596
CDVA gain of ≥ 1 Line
19.03 %
18.17 %
Chi2 p=0.597
CDVA loss of ≥ 1 Line
5.78 %
7.47 %
Chi2 p=0.1196
-0.06 ± 0.39
-0.02 ± 0.41
SE within 0.5D of emmetropia
89.38 %
88.01 %
Chi2 p=0.3102
SE within 1.0D of emmetropia
98.15 %
97.46 %
Chi2 p=0.284
+0.26 ± 0.31
+0.24 ± 0.29
88.55 %
90.17 %
UDVA mean ± SD in LogMAR
SE mean ± SD in D (aim=emmetropia)
CYL mean ± SD in D (absolute)
CYL ≤ 0.5D
Red/Green = Significantly worse/better outcome
Significance
U-test p<0.0001
U-test p=0.1642
U-test p=0.2076
Chi2 p=0.198
Post-op Assessment Forms
 These forms serve two purposes
 They allow us to answer any questions about healing, postop drop regimes, enhancement suitability, etc.
 They help us track our statistics, which in turn enables us
to make any adjustments necessary for future patients and
provide the best possible results to our mutual patients
Retreatment Rates
 Higher retreatment rates for high myopes (above -6.00)
 More likely to get undercorrection or regression
 High myopes are educated that their risk of retreatment is
higher than average
 Since 2006, the overall retreatment rate is 5.28%
 In 2014
 iLASIK retreatment rate was 2.29%
 PRK retreatment rate was 1.13% (smaller sample size)
RETREATMENTS
RETREATMENTS/ENHANCEMENTS
 Should be PATIENT DRIVEN!
 Keep it positive
 Don’t worry about “the numbers”
 Consider all factors including the ocular
surface!
RETREATMENT OPTIONS:
Relift Post LASIK
Repeat PRK
PRK on the LASIK flap
 Poor RSB
 Time since original LASIK Surgery
Retreatment Protocol
 Post LASIK:
 Typically 6m (ensuring STABILITY)
 Relift within 2 years (can vary with surgeon)
 Post PRK:
 AT LEAST 6m post Sx (usually between 6-12m)
 Stable refraction
 PRK over PRK
HORIZON LASER VISION CENTER
 Retreatment Policy:
 N/C within 2 years of original surgery
 2-5 years: $500 per eye
 2014
 Overall RTMT rate 2%
 Consistent between LASIK and PRK