is a sensory organ. Sensory organ is an organ that contains sensory receptors
and accessory structures, that contributes to the sensory function of the
receptor, included in the sensory organ. In the case of eye, the sensory part is
the retina which contains photoreceptors, bipolar, horizontal, amacrine, and
ganglionic cells. The other structures of the eye contribute to the function of
the eye (vision).
of the eye, it is an obligatory step to study its structure, because structure-
function interrelationship is inseparable .Our approach in studying ocular
physiology in this course will be by studying the function of each part of the
eye and the function, fulfilled by that structure. The eye ball is composed of
three layers (Sclera,
cornea, choroid, uvula, and retina)
and three transparent media (two chambers of aqueous humour, and vitreous
humour). Externally, the eye is protected by eyelids, eye lashes, and eye brows
.It is found in the orbit of the skull, and this is an additional protective
factor as thus is surrounded by bones.