Abstract

P 092

Topography-assisted keratometry (axial maps) vs. autorefractometry for SRK-II formula based intraocular lens power calculation in 99 eyes with cicatrizing trachoma

Bialasiewicz A. A.¹, Wali U. K.¹, Thakral A., 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 compare the outcome of topography-assisted biometry to keratometry estimates for the SRK-II formula in scarred trachoma eyes undergoing cataract surgery.
Methods: In a prospective controlled comparative case series 99 eyes were evaluated for pcIOL calculation using Humphrey-Atlas^® axial maps or autorefractometry for the SRK II formula. Phacoemulsification (Accurus^® 800) with pcIOL implantation (Acrysof, Alcon) was done, and postoperative refraction results were evaluated after 3 months.
Results: Patients: Mean age: 69.5 (±9) years, mean axial length: 22.9mm, mean K-values: 45.23/42.72D. Axial maps vs autorefractometry: Overall, pcIOL power estimates were significantly different (p<0.0001). Calculation differences of ³2-6.5D were seen in 35/99 eyes (35%). IOL power for implantation was taken from the axial map estimates, and postOP refraction results were spherical mean +0.34±0.87D, cylindrical mean -0.66±1.04D. Vision increase was a mean of 6.1±4.7 Snellen lines. The difference to preOP vision was highly significant (p=0.0001).
Conclusions: In this study, topography-assisted (axial maps) biometry using the SRK II formula yielded significantly more reliable pcIOL power estimates than autorefractometry in patients with severe trachomatous corneal scarring.

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