THE EYE Flashcards
1
Q
Sclera
A
- Outer white part of eye
- Tough protection
- Maintains eye shape
2
Q
Cornea
A
- protection
- outermost lens
- bends/focuses entry of light into eye
- does not receive blood only oxygen nutrients
3
Q
Iris
A
- regulates amount of light that passes through the pupil to retina/inner eye
- thin circular muscles act as diaphragm to control pupil size
- controls pupil size
4
Q
Pupil
A
Opening for light to enter inner eye
5
Q
Lens
A
Changes shape to focus on objects at different distances
6
Q
Choroid
A
•nourish outer layer of retina
7
Q
Retina
A
- Lines back of inner eye
- site of all receptors
- translates light stimulus into nerve impulse for visual recognition in brain
8
Q
Fovea centralis
A
- small pit on the retina
- only has cones
- most acute/sharp vision takes place here
9
Q
Suspensory ligaments
A
- Muscle connecting lens and ciliary body
* Adjusts shape of lens to increase/decrease light refraction
10
Q
Ciliary body/muscle
A
- holds lens in place
* helps to adjust lens shape
11
Q
Optic disk/Blind spot
A
- Beginning point of optic nerve
- entry point for nerve cells and retina blood vessels
- absence of cones/rods=blind spot
12
Q
Optic nerve
A
Made up of blood vessels and nerve cells
•transfers retinal visual stimuli through nerve cells to brain
13
Q
Posterior chamber
A
- filled with aqueous humor
- maintains pressure in eye
•flows from PC through pupil to AC
14
Q
Anterior chamber
A
- filled with aqueous humor
* maintains pressure in eye
15
Q
Aqueous humor
A
Watery fluid that maintains pressure needed to inflate eye
