Posters

Comparison of the measurement accuracy of intraocular lens power calculation in eyes after phototherapeutic keratectomy

Poster Details

First Author: S.Ito JAPAN

Co Author(s):    T. Senoo                    

Abstract Details

Purpose:

Comparison of the measurement accuracy of several methods of intraocular lens (IOL) power calculations for cataract surgery in eyes after phototherapeutic keratectomy (PTK)

Setting:

Retrospective, clinical case series at Dokkyo Medical University

Methods:

This retrospective study involved 18 eyes of 10 patients who underwent cataract surgery after PTK ( granular corneal dystrophy: 13 eyes, band keratopathy: 5 eyes) with the VISX STAR S4 excimer laser system (Johnson & Johnson Vision). The prediction error (the difference between the estimated postoperative spherical equivalent and the postoperative manifest refraction at the spectacle plane) was calculated using four formulas: SRK/T, Barrett Universal Ⅱ, Barrett True-K, and OKULIX ray tracing software.We compared the mean values of the arithmetic prediction errors among the four formulas.

Results:

The mean arithmetic prediction errors after cataract surgery for the four formulas were 0.67 ± 1.33D, -0.29 ± 1.53D, -0.76 ± 1.48D, -1.57 ± 1.38D, respectively.

Conclusions:

The Barrett Universal Ⅱ formula was the best accuracy of IOL power caluculation after PTK among the four formulas.

Financial Disclosure:

None