Intraoperative Pachymetry Using Spectral-Domain Optical Coherence Tomography during Accelerated Corneal Collagen Crosslinking

Table 1

Central corneal thickness measurements with ultrasound pachymetry and spectral-domain optical coherence tomography at 3 time points before ultraviolet A irradiation.

	Mean CCT USP; (range) (microns)	Mean CCT SDOCT; (range) (microns)	Mean TCT SDOCT; (range) (microns)
Baseline	470.0±36.2; (440–510)	481.3±37.8; (435–539); 𝑃=0.786	428.2±33.5; (395–480); 𝑃=0.063
After epithelial removal	421.3±25.8; (388–460)	439.0±42.4; (390–498); 𝑃=0.178	380.8±27.7; (356–430); 𝑃=0.031
After 30 minutes of riboflavin	330.0±30.3; (302–369)	342.5±39.4; (303–396); 𝑃=0.125	284.8±33.0; (249–341); 𝑃=0.063

CCT: central corneal thickness; TCT: thinnest corneal thickness; USP: ultrasound pachymetry; SDOCT: spectral-domain optical coherence tomography.
Values in microns are presented as mean ± standard deviation (range).
𝑃 values are for comparison with ultrasonic pachymetry.