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Effects of optical zone in LASIK with high myopia on the postoperative contrast sensitivity

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Session Details

Session Title: Presented Poster Session: Presbyopia

Session Date/Time: Saturday 05/09/2015 | 15:00-16:30

Paper Time: 15:50

Venue: Poster Village: Pod 2

First Author: : T.Yonekawa JAPAN

Co Author(s): :    S. Tamaoki   H. Uozato   T. Harada   K. Inoue   T. Tsuru  

Abstract Details


The contrast sensitivity has been reported to decrease after laser in situ keratomileusis (LASIK). We investigate influence of optical zone (OZ) in LASIK with high myopia (Spherical power:-6.00~-8.00D)on the postoperative contrast sensitivity and uncorrected visual acuity (UCVA).


Inouye Eye Hospital, Tokyo, Japan


The subjects were 66 eyes of 46 patients who underwent LASIK at our clinic. The subjects were randomly divided into two groups by OZ: 6.5mm group (33eyes, mean age: 30.6 years old, mean spherical equivalent: -6.69±0.44D) and 6.0mm group (33eyes, mean age: 37.7 years old, mean spherical equivalent: -6.91±0.57D). The target refractive correction was emmetropia in all cases. The contrast sensitivity was measured with a contrast-glare tester (CGT-1000™: TAKAGI, JAPAN), and analyzed using Area Under the Log Contrast Sensitivity Function (AULCSF). AULCSF and mean UCVA were analyzed statistically between the 2 groups (Mann–Whitney U Test).


At 3 months postoperatively, AULCSF (glare off) was 1.57 in 6.5mm group and 1.58 in 6.0mm group respectively. There are no difference between two groups in contrast sensitivity without glare (P=0.7000). However, AULCSF (glare on) was 1.56 in 6.0mm group and 1.47 in 6.0mm group respectively. The difference between two groups was statistically significant (P=0.0161). UCVA was -0.11±0.12 (logarithm of the minimum angle of resolution: log MAR) in 6.5mm group, and -0.08±0.14 (log MAR) in 6.0mm group respectively. There are no difference between two groups (P=0.2600).


OZ in LASIK may significantly affect the postoperative glare contrast sensitivity. Larger OZ is preferable for the high myopic patients than smaller one.

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