Contrast Sensitivity Changes after Phototherapeutic Keratectomy in Heterozygote Granular Corneal Dystrophy Type 2

Purpose: Contrast sensitivity, the ability to distinguish relative difference in luminance of an object from its surrounding or adjacent objects, is a useful measure visual function. In granular corneal dystrophy type 2 (GCD2), opacity stroma causes deterioration We compared contrast sensitivity GCD2 patients before and after phototherapeutic keratectomy (PTK) evaluate perioperative function these patients.Methods: This study included 22 eyes heterozygote patients. The acuity were measured PTK. was mesopic photopic background luminances, with glare (G) levels 0-2 (G0, G1, G2, respectively) spatial frequencies at 1.5, 3, 6, 12, 18 cycles per degree (cpd).Results: increased PTK 1.5 3 cpd conditions G0-2 (p < 0.05). At 6 cpd, condition G1 glare, However, there no change any level 12 PTK.Conclusions: patients, significantly vision which decreased due opacity, improved