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39 Cards in this Set

  • Front
  • Back
The eyeball fits into what?
the orbital cavity
What does the conjunctival membrane do?
provides lubrication and protection
What is the purpose of the lacrimal glands and ducts?
produce and deliver tears
orbital cavity
The cavity or socket of the skull in which the eye and its appendages are situated
Of, pertaining to or affecting the eye.
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.
The outer eye consists of what (5)?
1)orbital cavity
2)extrinsic ocular muscles
4)conjunctuval membrane
5)lacrminal apparatus
What provides movement for the eyeball?
ocular muscles
What is the purpose of the eyelids (3)?
1)provides protection from light
2)provides protection from dust
3)provides protection from trauma
What does the lacrimal apparatus do?
produces, delivers and drains tears from the eye
[L. extrinsecus situated on the outside] coming from or originating outside; having relation to parts outside the organ or limb in which found.
extrinsic ocular muscles
the muscles within the orbit but outside of eyeball; provide movement for the eyeball
A clear membrane that coats the inner aspect of the eyelids and the outer surface of the eye.
conjunctival membrane
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
lacrminal apparatus
The tear-forming and tear-conducting system which includes the lacrimal glands, eyelid margins, conjunctival sac, and the tear drainage system.
Pertaining to the tears.
The inner eye (eyeball) consists of what 3 layers?
1)outer layer
2)middle layer
3)inner layer
(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
(part of the outer layer of the eyeball)-- center for focusing;consists of 5 layers and is protected by tears.
(part of the middle layer of the eyeball)-- contains blood vessels that supply nutrients to the eye
How many rods are in each eye?
120 million
ciliary body
(part of the middle layer of the eyeball) -- contains muscles that adjust the shape of the lens, produces aqueous humor
aqueous humor
It is a clear, watery fluid that flows between and nourishes the lens and the cornea; it is secreted by the ciliary processes
(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
(part of the middle layer of the eyeball)-- opening in center of iris, regulating the amount of light coming into the eye
The middle layer (one of the 3 layers of the inner eye) consists of what (4)?
2)ciliary body
The outer layer (one of the 3 layers of the inner eye) of the eyeball consists of what (2)?
The inner layer (on of the 3 layers of the inner eye)consists of what (3)/
(part if the inner layer of the eyeball) -- nerve layer of the eye containing rods and cones.
(part of the inner layer of the eyeball)-- function in dim light--responsible for night vision
(part of the inner layer of the eyeball) -- responsible for bright-light vision
How many cones are in each eye?
6 million
What is not considered to be a part of one of the layers of the eyeball (inner eye)?
the lens
In ophthalmology, the bending of light that takes place within the human eye.
What happens as light passes through the lens?
it is bent (refraction)
In order to focus light, the lens must do what?
must change its shape
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
The changing of the shape of the lens is called what?
With aging the lenses lose some elasticity. What can be used to provide additional refraction that the lenses can no longer provide.
reading glasses