Visual performance of patients with interface haze after femtosecond laser-assisted laser in situ keratomileusis

Session Details

Session Title: LASIK I

Session Date/Time: Sunday 23/09/2018 | 14:00-16:00

Paper Time: 14:34

Venue: Room A3, Podium 2

First Author: : C.Sun TAIWAN

Co Author(s): :    S. Chen   J. Huang                 

Abstract Details

Purpose:

To investigate the visual performance in eyes with corneal haze after thin-flap femtosecond laser-assisted LASIK (FS-LASIK).

Setting:

One refractive center in Taiwan.

Methods:

A total of thirteen patients (26 eyes) who underwent FS-LASIK were recruited. Corneal haze was observed in 14 eyes (haze group). All eyes that developed corneal haze had unintended ultra-thin flaps (<70μm thickness) under 90μm thickness flap setting. The other 12 eyes were recruited as non-haze group. Haze grading, visual acuity and contrast sensitivity were measured preoperatively and at 1 month, 3 months, 6 months, and 12 months postoperatively. Flap thickness was measured by intraoperative pachymeter and corneal optical coherence tomography (OCT) at 6-month postoperatively.

Results:

Postoperative corrected distance visual acuity (CDVA) was significantly improved at 1, 6, and 12 months in both groups. There was no significant difference of visual acuity between haze and non-haze groups (p=0.311). The logarithmic units of contrast sensitivity score (LogCS) improved postoperatively in both groups, especially in higher spatial frequencies and under scotopic condition. There was no significant difference of LogCS in all spatial frequencies under both photopic and scotopic conditions in both groups. The measured flap thickness was significantly thinner than the programmed thickness, and the error of applanation cone correction was thought to contribute to this discrepancy.

Conclusions:

Corneal haze after FS-LASIK rarely occurs, and it did not affect visual performance measured by CDVA and contrast sensitivity. The safety of FS-LASIK is reassured even in eyes developing corneal haze postoperatively.

Financial Disclosure:

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