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39 Cards in this Set
- Front
- Back
The eyeball fits into what?
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the orbital cavity
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What does the conjunctival membrane do?
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provides lubrication and protection
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What is the purpose of the lacrimal glands and ducts?
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produce and deliver tears
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orbital cavity
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The cavity or socket of the skull in which the eye and its appendages are situated
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ocular
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Of, pertaining to or affecting the eye.
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eyelids
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The lid or cover of the eye, a movable fold of skin and muscle that can be closed over the eyeball or opened at will. Each eye has an upper and a lower lid. An eyelid is also called a palpebra.
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The outer eye consists of what (5)?
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1)orbital cavity
2)extrinsic ocular muscles 3)eyelids 4)conjunctuval membrane 5)lacrminal apparatus |
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What provides movement for the eyeball?
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ocular muscles
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What is the purpose of the eyelids (3)?
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1)provides protection from light
2)provides protection from dust 3)provides protection from trauma |
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What does the lacrimal apparatus do?
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produces, delivers and drains tears from the eye
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extrinsic
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[L. extrinsecus situated on the outside] coming from or originating outside; having relation to parts outside the organ or limb in which found.
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extrinsic ocular muscles
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the muscles within the orbit but outside of eyeball; provide movement for the eyeball
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conjunctiva
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A clear membrane that coats the inner aspect of the eyelids and the outer surface of the eye.
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conjunctival membrane
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The mucous membrane which covers the external surface of the ball of the eye and the inner surface of the lids; the conjunctival membrane;provides lubrication and protection
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lacrminal apparatus
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The tear-forming and tear-conducting system which includes the lacrimal glands, eyelid margins, conjunctival sac, and the tear drainage system.
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lacrimal
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Pertaining to the tears.
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The inner eye (eyeball) consists of what 3 layers?
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1)outer layer
2)middle layer 3)inner layer |
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sclera
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(part of the outer layer of the eyeball)-- tough,white,fibrous,connective tissue that maintains shape of the eye and protects the inner layers of tissue
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cornea
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(part of the outer layer of the eyeball)-- center for focusing;consists of 5 layers and is protected by tears.
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choroid
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(part of the middle layer of the eyeball)-- contains blood vessels that supply nutrients to the eye
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How many rods are in each eye?
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120 million
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ciliary body
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(part of the middle layer of the eyeball) -- contains muscles that adjust the shape of the lens, produces aqueous humor
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aqueous humor
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It is a clear, watery fluid that flows between and nourishes the lens and the cornea; it is secreted by the ciliary processes
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iris
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(part of the middle layer of the eyeball) -- colored part of the eye; muscular diaphragm that controls the size of the pupil; it forms the colored portion of the eye
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pupil
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(part of the middle layer of the eyeball)-- opening in center of iris, regulating the amount of light coming into the eye
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The middle layer (one of the 3 layers of the inner eye) consists of what (4)?
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1)choroid
2)ciliary body 3)iris 4)pupil |
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The outer layer (one of the 3 layers of the inner eye) of the eyeball consists of what (2)?
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1)cornea
2)sclera |
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The inner layer (on of the 3 layers of the inner eye)consists of what (3)/
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1)retina
2)rods 3)cones |
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retina
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(part if the inner layer of the eyeball) -- nerve layer of the eye containing rods and cones.
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rods
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(part of the inner layer of the eyeball)-- function in dim light--responsible for night vision
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cones
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(part of the inner layer of the eyeball) -- responsible for bright-light vision
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How many cones are in each eye?
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6 million
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What is not considered to be a part of one of the layers of the eyeball (inner eye)?
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the lens
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refraction
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In ophthalmology, the bending of light that takes place within the human eye.
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What happens as light passes through the lens?
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it is bent (refraction)
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In order to focus light, the lens must do what?
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must change its shape
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accommodation
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the ability of the eye to change its focus from distant to near objects (and vice versa). This process is achieved by the lens changing its shape
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The changing of the shape of the lens is called what?
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accommodation
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With aging the lenses lose some elasticity. What can be used to provide additional refraction that the lenses can no longer provide.
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reading glasses
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