FIGURE 1.

Change in mean keratometric power (± standard error) after penetrating keratoplasty (PK) for keratoconus and Fuchs' dystrophy. Over the study period, mean keratometric corneal power increased after PK for keratoconus (P < .001) but was unchanged after PK for Fuchs' dystrophy (P = .55). When comparing keratoconus to Fuchs' dystrophy (indicated by asterisk), the change in mean keratometric corneal power was not different before 10 years after PK (P = .63), but was greater in keratoconus beyond 10 years after PK (P = .002).