Abstract

The purpose is to describe image quality metrics such as modulation transfer function (MTF) and Strehl ratio and higher order aberration (HOA) with corneo scleral lens (CSL) in keratoconus. A 25-year-old male visited the outpatient department with a complaint of diminution of distance vision in the right eye. His best-corrected visual acuity was 6/60 and 6/6 partial in the right and left eyes, respectively. Slit-lamp examination revealed right eye keratoconus and left eye was Forme fruste keratoconus. There was a history of corneal collagen cross-linking with riboflavin in the right eye. The patient was dispensed with corneo-scleral contact lens and the left eye was managed with spectacle. Corneal HOA, MTF, and Strehl ratio were measured without and with CSL using iTrace aberrometer. A significant reduction in corneal HOA and improvement in image quality metrics were noted with CSL.

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