The inner (sensitive) membrane of the eyeball (tunica interna, s. sensoria bulbi), or retina, is tightly adjacent on the inner side to the vascular membrane along its entire length - from the exit point of the optic nerve to the edge of the pupil.
The iris is the most anterior part of the choroid, visible through the transparent cornea. It has the appearance of a disk about 0.4 mm thick, placed in the frontal plane.
The cornea is one of the transparent media of the eye and is devoid of blood vessels. It has the appearance of a watch glass, convex in front and concave in the back. The diameter of the cornea is 12 mm, the thickness is about 1 mm.
The eye (oculus; Greek ophthalmos) consists of the eyeball and the optic nerve with its membranes. The eyeball (bulbus oculi) is round, and it has poles - anterior and posterior (polus anterior et polus posterior). The anterior pole corresponds to the most protruding point of the cornea, the posterior pole is located lateral to the point where the optic nerve exits the eyeball.
