TERMS

accommodation

adjustment of eye for various distancs so that the image falls on the retina of the eye

acuity

clearness or sharpness of a sensory function

adnexa

tissues or structures in the body adjacent to or near a related structure

aritculate

to join or connest together loosely to allow motion between the parts

gustation

sense and act of tasting food, beverages, or other sustances

humor

any fluid or semifluid of the body

labyrinth

series of intricate communicating passages

olfaction

the act and sense of smell

ossicle

and small bone, especially onr of the three ears bones

photopigment

light-sensitive pigment in the retinal cones and rods that absorbs light and initiates the visual process; also called visual pigment

slit lamp

microscope with a specialized light that allows magnification of eye structures-especially the lens, and iris-and, with additional attachments, the vitreous humor and retina

tunic

a layer or coat of tissue; also called membrane layer

achromatopsia

severe congenital deficiency in color percerption, also called color blindness

chalazion

small, hard tumor developing on the eyelid, somewhat similar to a sedaceous cyst

conjuctivitis

inflammation of the conjuctiva with vascular congestion, producing a red or pink eye

convergence

medical movement of the two eyeballs so that they are both directed at the object being viewed

diopter

measurement of refractive error

ectropin

eversion, or outward turning of the edge of the lower eyelid

emmetropia

normal condition of the eye in refraction in which when the eye is at rest parallel rays focus exactly on the retina

entropion

inversion, or inward truning, of the edge of the lower eyelid

epiphora

abnormal overflow of tears

exophthalmos

protrusion of one or both eyeballs

hordeolum

localized circumscribed inflammatory swelling of one of the several ssebaceous glands of the eyelid, STY

metamorphopssia

visual distortion of objects

nyctalopia

inability to see well in dim light, NIGHT VISION

nystagmus

involutary eye movement that appear jerky and may reduce vision or be assiociated with other, more serious conditions that limit vision

papilledema

edema and hyperemia of the optic disc usually associated with increased ocular pressure resulting from intracranial pressure, CHOKED DISC