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34 Cards in this Set

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White portion of the eye. Tough, Fibrous membrane which maitains the shape of the eyeball and serves as a protective covering for the eye.
sclera
Color portion of the eye.
iris
Center of the iris.
Controls the amount of light entering the eye, and its diameter is regulated by the relaxing and contracting of the iris.
pupil
Thin mucous membrane layer that lines the anterior part of the eye, which is exposed to air, and the inner part of the eyelids.
conjunctiva
Located at the upper outer edge of each eye (under the upper eyelid).
Produces tears.
lacrimal gland
Antibacterial enzyme which destroys microorganisms.
lysozyme
Tears drain through this duct.
lacrimal duct
The lacrimal duct is located at the __________ (inner edge) of the eye.
canthus
Continuous with the skin and cover the eyeball, keeping the surface of the eyeball lubricated and protected from dust and debris through their blinking motion.
Upper and lower eyelids.
Located along the edges of the eyelids. Protect the eyeball by prevventing foreign materials and/or insects from coming in contact with the surface of the eyeball.
eyelashes
A transparent, nonvascular layer covering the colored part of the eye (iris).
cornea
Located in the vascular middle layer of the eye. Contains 3 structures: iris, ciliary body, suspensory ligaments.
choroid
Three structures of the choroid.
iris
ciliary body
suspensory ligaments
Two sets of muscles within the iris.
radial muscles
circular muscles
Muscles within the iris that dilate the pupil in dim light to allow more light to enter the eye.
radial muscles
Muscles within the iris that constrict the pupil in bright light to allow less light to enter the eye.
circular muscle
Posterior to the iris.
Colorless biconvex structure that aids in focusing the images clearly on the sensitive nerve cell layer called the retina.
lens
Located on each side of the lens.
Contains muscles that are responsible for adjusting the lens to view near objects.
ciliary body
Radiating from the ciliary body are numerous straight fibrils called _____________ that attach to the lens and hold it in place.
suspensory ligaments
Ability of the lens to clearly focus on objects at various distances.
accommodation
Innermost layer of the eye.
Changes the energy of the light rays into nerve impluses.
retina
Nerve cells which are highly specialized for stimulation by light rays.
rods and cones
Responsible for visualizing colors, central vision, and vision in bright light.
cones
Highest concentration of cones is in the ___________, a small depression located within the macula lutea.
fovea centralis
An oval, yellowish spot near the center of the retina.
macula lutea
When the image focuses directly on the fovea centralis, the sharpest image is obtained. This is known as _________.
central vision
Responsible for vision in dim light and for peripheral vision. Located at the outer edges of the retina.
rods
Impulses from the retina are transmitted through the______ to the brain where they are interpreted as vision.
optic nerve
Only part of the retina that is insensitive to light because it contains no rods or cones. Also known as the blind spot of the eye.
optic disc
Two cavities of the interior of the eye.
anterior cavity
posterior cavity
The anterior cavity contains the _____, located in front of the lens and the _______, lcoated behind the lens.
anterior chamber
posterior chamber
Clear, watery fluid which fills the anterior & posterior chambers.
aqueous humor
Clear, jellylike substance found in the posterior cavity that gives shape to the eyeball.
vitreous humor
Bending of light rays as they pass through the various structures of the eye to produce a clear image on the retina.
refraction