5Almubrad T, Akhtar S. Structure of corneal layers, collagen fibrils, and proteoglycans of tree shrew cornea [ J]. Mol Vision, 2011,17 : 2238 - 2291.
6Williams R, Fink BA, King-Smith PE, et al. Central corneal thickness measurements : using an ultrasonic instrument and 4 optical instruments [J]. Cornea, 2011, 30: 1238-1243.
7Huang J, Savini G, Hu L, et al. Precision of a new Scheimpflug and Placido-disk analyzer in measuring corneal thickness and agreement with ultrasound pachymetry [ J ]. J Cataract Refract Surg, 2013, 39:219-224.
8Worner C, Olguin A, Ruiz-Garcia J, et al. Cell pattern in adult human corneal endothelium [ J]. PLoS One, 2011, 6 (5) : e19483.
9Shao YL, Huang YQ, Liu YP, et al. Corneal cell density and morphology in healthy Chinese eyes [ J]. Cornea, 2007, 26: 130 - 132.
10PA M. Corneal endothelial cell density and morphology in normal Malay eyes [ J]. Med J Malaysia,2011, 66 : 300 - 303.