RTVue-OCT with a corneal adaptor mo

RTVue-OCT with a corneal adaptor module was used in this study. The system works at 830-nm wavelength，and has a scan speed of 26 000 axial scans per second. The depth resolution is 5 mm (full-width half-maximum) in tissue. The RTVue corneal adaptor module software (version 5.5) automatically processes the OCT scans to provide the 6-mm scan diameter pachymetry map and the minimum corneal thickness. An epithelium mapping software (RTVue epithelium mapping) was used to study the epithelium thickness profile。