Anatomy Ophthalmologic Examination ☆ Course Objectives: To master the anatomy of the eye ball especially the histologic structure of cornea and retina cornea is a transparent tissue. The average adult cornea is 550 um thick in the center, about 11.75 mm in diameter horizontally and 10.6 mm vertically. From anterior to posterior, it has five distinct layers: the epithelium\ Bowmans laver the stroma Descemet's membrane\ the endotheliumAnatomy & Ophthalmologic Examination Course Objectives: To master the anatomy of the eye ball, especially the histologic structure of cornea and retina. cornea is a transparent tissue. The average adult cornea is 550 μm thick in the center, about 11.75 mm in diameter horizontally and 10.6 mm vertically. From anterior to posterior, it has five distinct layers : the epithelium\ Bowman’s layer\the stroma\Descemet’s membrane\ the endothelium