Evaluation of Macular and Choroidal Thickness in Patients with Subclinical Keratoconus

Objective: To evaluate choroidal thickness (CT) and central macular thickness (CMT) in eyes with keratoconus and subclinical keratoconus (SKC), and in age-and sex-matched healthy controls. Materials and Methods: This cross-sectional study included 18 patients with keratoconus in one eye and SKC in the other, and 18 controls. The CMT and CT measurements were obtained from all participants. Measurements were taken at the subfoveal CT, the CT at 750 [micro]m nasal and temporal to the fovea, and the CT at 1500 [micro]m nasal and temporal to the fovea. Results: No significant difference was noted in the mean CMT values among the three groups (p>0.05). The mean subfoveal, N750, N1500, T750, and T1500 CT values in the keratoconus group were significantly higher than those in the SKC and control groups (p0.05). Conclusion: Although we have shown that CT is increased in patients with keratoconus, the measurement of choroidal and macular thicknesses does not appear to be a useful technique to differentiate eyes with SKC from healthy eyes or to follow the progression of the disease. Keywords: Keratoconus, choroidal thickness, macular thickness, subclinical keratoconus