Eye Lab Vocab Flashcards
adjustment of the eye for various distances through modification of the lens curvature
Accommodation
a set of charts with various geometric shapes in black and white, used for detecting defects of the central visual field
Amsler Grid
inequality of the diameter of the pupils; may be normal or congenital. often normal if inequality is within 1mm
Anisocoria
a condition in which part or all of the crystalline lens of the eye is absent, usually because of surgical removal for the treatment of cataracts
Aphakia
the watery transparent liquid containing trace albumin and small amount of salts
Aqueous Humor
an abnormal condition in which the light rays cannot be focused clearly in a point on the retina because of an irregular curvature of the cornea or lens
Astigmatism
opacity of the lens; most commonly resulting from denaturation of the lens protein caused by aging
Cataracts
small, hard tumor analogous to sebaceous cyst developing on the eye lids, formed by the distention of a meibomian gland with secretion
Chalazion
the middle vascular tunic of the eye lying between the retina and the sclera. dark brown vascular coat of the eye between the sclera and retina, extending from ora serrata to optic nerve. consists of blood vessels united by connective tissue containing pigmented cells and is made up of five layers
Choroid
the thickened part of the vascular tunic of the eye that joins the iris with the anterior portion of the choroid. consist of three zones: ciliary disk, ciliary crown, and ciliary muscle
Ciliary body
the photosensitive, outward-directed, conical process of a cone cell essential for sharp vision and color vision; these are the only photoreceptor in the fovea centralis and become interspersed with increasing numbers of rods toward the periphery of the retina
Cones
a test for estimating peripheral vision
Confrontation
the mucous membrane investing the anterior surface of the eyeball and the posterior surface of the lids
Conjunctiva
inflammation of the conjunctiva caused by infectious agents or by allergies; commonly called pink eye
Conjunctivitis
the clear, transparent anterior portion of the fibrous coat of the eye comprising about one sixth of its surface. it is the chief refractory structure of the eye
Cornea
opaque white ring about corneal periphery, seen in many individuals older than 60 years of age. this is due to deposit of lipids in the cornea or to hyaline degeneration. may indicate a lipid disorder, most commonly type II hyperlipidemia if present before the 40 years of age
Corneal Arcus (if seen in younger people, it is called arcus juvenilis)
an ill-defined yellow area due to infarction of the nerve layer of the retina
Cotton Wool Spot
perception of spatial relationships; three dimensional perception. the visual ability to judge depth or distance
Dept Perception
a condition characterized by dot hemorrhages or microaneurysms and the presence of hard and soft exudates
Diabetic Retinopathy (background)
condition characterized by development of new vessels as a result of anoxic stimulation; vessels grow out of the retina toward the vitreous humor
Diabetic Retinopathy (proliferative)
refractive power of the lens with focal distance of 1 meter, used as unit of measurement in refraction
Diopter
the condition in which a single object is perceived as two objects (double vision)
Diplopia
tiny yellow or white deposits in the retina of the eye or on the optic nerve head
Drusen
eversion (outward rolling) of an edge or margin; as the edge of the eyelid
Ectropion (ect- outside)