Eye anatomy
Accommodation
Ability to focus for close vision (under 20 feet)
Fovea Centralis
Area of acute or discriminatory vision
Optic Disk
Area of retina that lacks photoreceptors
Ciliary zonule
Attaches the lens to the ciliary body
Astigmatism
Blurred vision, resulting from unequal curvatures of the lens or cornea.
Cataract
Clouding of the lens, resulting in loss of sight
Glaucoma
Condition of increasing pressure inside the eye, resulting from blocked drainage of aqueous humor
Canal of Schlemm
Drains the aqueous humor of the eye
Aqueous humor
Fluid in the anterior segment that provides nutrients to the lens and cornea
Refraction
Light bending
Convergence
Medial movement of the eyes during focusing on close objects.
Emmetropia
Normal vision
Ciliary body
Nutritive (vascular) layer of the eye
Sclera
The "white"of the eye
Myopia
nearsightedness
Hyperopia
Inability to focus well on close objects; farsightedness
Night blindness
Inability to see well in the dark; often due to Vitamin A deficiency
Retina
Layer containing the rods and cones
Iris
Pigmented "diaphragm" of the eye
Photopupillary reflex
Reflex constriction of pupils when they are exposed to bright light
Accommodation pupillary reflex
Reflex constriction of pupils when viewing close objects
Cornea, Aqueous Humor, Lens, Vitreous Humor
Refractory media of the eye