Introduction The structures of the eye cornea a transparent structure that allows light to enter the eye pupil iris covered by the conjunctiva, a transparent mucous membrane login to view 4 more bullets lens sclera limbus which is the border of the cornea and sclera medial and lateral canthus retina Light enters the eye through the cornea and lens which results in an image (inverted and reversed) being formed in the retina the area on the retina with the highest visual acuity is the fovea, which is surrounded by the macula medial (nasal) to the fovea is the optic disc, which login to view 2 more bullets photoreceptors login to view 8 more bullets choroid is a vascular layer of the eye ciliary body is found between the choroid and the iris and is composed of the ciliary muscle which is controlled by the parasympathetic fibers in the oculomotor nerve in order to login to view 1 more bullet ciliary processes which have zonular fibers extending from this structure to the lens forming the suspensory ligament Lens transparent biconvex disc behind the pupil that provides additional refractive power. Is composed of: lens capsule subcapsular epithelium lens fibers disease processes that affect the lens include cataracts - opacifiction of the crystalline lens ectopia lentis - lens dislocation presbyopia - decreased elasticity of the lens leading to impaired accomodation Anterior chamber describes the area behind (posterior) to the cornea and infront (anterior) to the iris Posterior chamber describes the area posterior to the iris and anterior chamber Aqueous humor pathway the ciliary body produces aqueous humor into the posterior chamber which flows through the space between the lens and iris into the login to view 3 more bullets Blood supply an arterial source is from the ophthalmic artery the short posterior, long posterior, and anterior ciliary arteries central retinal artery which login to view 1 more bullet occlusion presents as painless, acute loss of vision in the affected eye venous drainage is from the vorticose veins central retinal veins