eye Flashcards
1
Q
cornea
A
refracts light into eye
2
Q
iris
A
controls how much light enterd the pupil
3
Q
lens
A
refracts light, focusing it to retina
4
Q
c
ciliary muscles
A
tenses/relaxes in order to move the suspensory ligaments (attached to lens)
5
Q
retina
A
light sensitive and is covered in rods + cones
6
Q
rods
A
more sensitive in dim light
7
Q
cones
A
sensitive to colours
8
Q
optic nerve
A
carries impulse from receptor to brain
9
Q
focusing on objects
A
- distant: ciliary muscle relaxes, suspensory ligaments tighten, lens less rounded
- near: ciliary muscle contracts, suspensory ligaments slack, lens more rounded
10
Q
long sighted
A
why:
* lens is wrong shape and cant refract light right
* eyeball too short
* images are brought into focus behind retina
solution:
* convex lens
11
Q
short sighted
A
why:
* lens wrong shape
* eyeball too long
* focused in front of retina
solution:
* concave lens
