SAN FRANCISCO — Topographically guided PRK was effective in treating irregular astigmatism after penetrating keratoplasty, according to a study presented here.
Best corrected visual acuity improved in almost half of all eyes, Simon P. Holland, MD, said at the American Society of Cataract and Refractive Surgery meeting.
Simon P. Holland
"Topographically guided PRK for irregular astigmatism after penetrating keratoplasty using custom topographical neutralization offered promising results with good safety and efficacy," Holland said.
The retrospective case series included 49 eyes that underwent topographically guided PRK after previous PK.
Surface ablation was performed with the Allegretto WaveLight excimer laser (Alcon). The custom topography neutralization technique was used to modify manifest refraction based on refractive changes predicted from plano topographically guided correction.
Uncorrected and corrected distance visual acuity, refraction, keratometry, topography and haze were evaluated at 3, 6 and 12 months after surgery; 39 eyes completed at least 6 months of follow-up.
Study results showed that uncorrected visual acuity improved to 20/40 or better in 18 eyes (46%).
Best corrected visual acuity improved in 16 eyes (42%); eight eyes (21%) gained one line and eight eyes (21%) gained two or more lines. Five eyes (13%) lost one line and three eyes (8%) lost two or more lines.
Postoperative cylinder ranged from 0 D to 6 D. The re-treatment rate was 5.76%, Wade said.
Disclosure: Holland is a member of the speakers bureau for Allergan and Bausch + Lomb and receives research funding from Alcon.