Eye General View
The eyeball is not a simple sphere but can be viewed as the result of fusing a small portion of a small, strongly curved sphere with a large portion of a large, not so strongly curved sphere.
Eyelid
It is vitally important that the front surface of the eyeball, the cornea, remain moist. This is achieved by the eyelids, which during waking hours sweep the secretions of the lacrimal apparatus and other glands over the surface at regular intervals and which during sleep cover the eyes and prevent evaporation.
Lacrimal System
The lacrimal system comprises of a series of anatomical structures with specific physiologic properties.
Lid Eversion
Eyelid eversion is used to expose the superior palpebral conjunctiva and fornix, so that foreign matter can be identified in these areas.
Optic Pathways
The optic pathway includes the retina, optic nerve, optic chiasm, optic radiations, and occipital cortex (see figure Higher visual pathways ).
