Anatomy: Eye

accomodation

ability to focus for close vision(under 20 feet)

cornea

anteriormost part of the sclera- window on the world

fovea centralis

area of acute or discriminatory vision

optic disk

area of retina that lacks photoreceptors

suspensory ligament

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 insidethe eye, resulting from blocked drainage of aqueous humor

ciliary body

contains muscle that controls the shape of the lens

canal of schlemm

drains the aqueous humor of the eye

aqueous humor

fluid that provides nutrients to the lens and cornea

vitreous humor

gel-like substance that helps to reinforce the eyeball

hypertropia

inability to focus well on close objects, farsightedness

night blindness

inability to see well in the dark, often resulting from a vitamin A deficiency

refraction

light bending

convergence

medial movement of the eye during focusing on close objects

myopia

nearsightedness

emmetropia

normal vision

choroid coat

nutritive(vascular) tunic of the eye, heavily pigmented tunic that prevents light scattering within the eye

iris

pigmented diaphragm of the eye

accomodation pupillary reflex

reflec constriction of pupils when viewing close objects

photopupillary reflex

reflex-constriction of pupils when they are exposed to bright light

cornea, aqueous humor, lens, vitreous humor

refractory media of the eye

iris, ciliary muscle

smooth muscle structures(intrinsic eye muscles)

sclera

the "white" of the eye

retina

tunic, containing the rods and cones