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Purpose.

To report baseline differences between eyes on key variables in the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study cohort compared with a retrospectively assembled group of myopic contact lens wearers without ocular disease.

Methods.

A total of 1,079 keratoconus patients who had not undergone a penetrating keratoplasty in either eye before their baseline visit were enrolled and examined at baseline. Records from 330 contact lens-wearing myopes were reviewed. Corneal curvature (keratometry), visual acuity, refractive error (manifest refraction), and corneal scarring were measured.

Results.

The mean differences between keratoconic eyes are as follows (better eye–worse eye for each variable, separately). Flat keratometry:− 3.59±4.46 D and steep keratometry:− 4.35±4.41 D; high-contrast best-corrected visual acuity: 7.30±6.83 letters; low-contrast best-corrected visual acuity: 8.53 …