24 terms

Eye disorder flashcards Basic Vocab. #9

Sense Organs: The Eye: VOCABULARY
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Accommodation
normal adjustment of the eye to FOCUS ON OBJECTS FROM FAR TO NEAR.
Anterior Chamber
area BEHIND CORNEA IN FRONT OF LENS AND IRIS. (contains aqueous humor)
aqueous humor
FLUID produced by the ciliary body. found in the anterior chamber
Biconvex
TWO round, elevated, and curved evenly surfaces. LIKE PART OF A SPHERE.
Choroid
MIDDLE, vascular layer of the eye BETWEEN retina and sclera.
Ciliary Body
STRUCTURE SURROUNDING LENS connects the choroid and iris
Cone
PHOTORECEPTOR CELL in the RETINA that TRANSFORMS LIGHT ENERGY INTO A NERVE IMPULSE. responsible for COLOR and CENTRAL VISION.
Conjunctiva
DELICATE MEMBRANE lining the undersurface of the eyelids
Cornea
Fibrous transparent layer of CLEAR TISSUE THAT EXTENDS OVER ANTERIOR PART OF EYEBALL.
Fovea Centralis
Tiny pit or DEPRESSION IN RETINA that is the region of CLEAREST VISION.
Fundus of the Eye
Posterior, INNER PART OF THE EYE
Iris
Pigmented (colored) layer that opens and closes to ALLOW MORE OR LESS LIGHT INTO THE EYE.
Lens
Transparent, biconvex body BEHIND THE PUPIL. it BENDS LIGHT RAYS TO BRING THEM INTO FOCUS ON THE RETINA
Macula
YELLOWISH REGION ON THE RETINA. lateral to and slightly below the optic disc.
Optic Chiasm
Point at which optic nerve fibers CROSS IN THE BRAIN
Optic Disc
Region at back of the eye where OPTIC NERVE MEETS THE RETINA. (blind spot of the eye b/c it contains only nerve fibers, no rods or cones)
Optic Nerve
CRANIAL NERVE carrying impulses from RETINA to BRAIN
Pupil
CENTRAL OPENING OF EYE.
Refraction
BENDING of light rays by the cornea, lens, and fluids of the eye to bring rays into focus on retina.
Retina
LIGHT SENSITIVE NERVE CELL layer of the eye containing photoreceptor cells (CONES AND RODS)
Rod
PHOTORECEPTOR CELL OF RETINA (essential for vision in dim light and peripheral vision)
Sclera
TOUGH WHITE OUTER COAT of the eyeball.
Thalamus
RELAY CENTER OF THE BRAIN
Vitreous Humor
Soft JELLY-LIKE MATERIAL behind the lens in the vitreous chamber. (helps maintain the shape of the eyeball)