Abstract

P 181

Outcomes of topography-assisted biometry for SRK-II formula based intraocular lens power calculation in 48 eyes with cicatrizing trachoma unassessable by autorefractometry

Wali U. K.¹, Bialasiewicz A. A.¹, Thakral A.¹, Al-Belushi H.¹, Rizvi G.^2
1Department of Ophthalmology and School of Ophthalmic Technicians, ²Department of Epidemiology and Statistics, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman

Objective: To evaluate the outcome of topography-assisted biometry in heavily scarred trachoma eyes undergoing cataract surgery.
Methods: In a prospective case series of 48 eyes unassessable by autorefractometry outcomes for SRK-II formula-based pcIOL calculations using Humphrey-Atlas^® axial maps were evaluated. Phacoemulsification (Accurus^® 800) with pcIOL implantation was done, and postoperative refraction evaluated after 3 months.
Results: Patients: Mean age: 61.7 (±7) years, mean axial length: 23.4mm, mean K-values: 45.66/42.58D. pcIOL power calculations using axial maps compared to keratometry estimates were significantly different (p<0.0001). Calculation differences amounted to ³2-9D in 20/48 eyes (42%). IOL power for implantation was taken from the axial map estimates, and postOP refraction results were spherical: mean +0.75±1.5D and cylindrical: mean -1.43±1.16D. Spherical equivalents tended towards overcorrection (75%). Vision increase was a mean of 5.3±4.1 Snellen lines (not different to the historical comparison of autorefractometry-assessable eyes, p=0.446). The difference to preOP vision was highly significant (p=0.0001).
Conclusions: Axial map-assisted K-readings yield more accurate pcIOL power calculations in autorefractometry-unassessable eyes than keratometry charts, which are still widely used in developing countries of the Middle East for patients with severe corneal scarring undergoing cataract surgery.

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