Table 2: Central corneal thickness measured with spectral-domain optical coherence tomography between eyes with and without lid speculum.

With lid speculum
(range) (microns)
Without lid speculum
(range) (microns)


After epithelial removal

After 30 minutes of riboflavin

Total percentage of reduction % %0.100

CCT: central corneal thickness; USP: ultrasound pachymetry; SDOCT: spectral-domain OCT.
Values in microns are presented as mean ± standard deviation (range if available).