vision

Question 1

what is the path of light through the eye

Answer 1

• cornea (connected to sclera)
• aqueous humor (space b/t cornea and lens)
• pupil (opening in the iris)
• iris (gives eye its color)
• lens (held in place by suspensory ligaments - dilates and constricts to regulate light)
• vitreous humor (keep eyeball with right pressure)
• retina (where photoreceptors are)
• pigmented layer (biggest blood vessels)&raquo_space; sclera (white of the eye for protection)

Question 2

what is accommodation

Answer 2

when the ciliary bodies change the lens shape

distance vision:
- ciliary bodies relaxed
- suspensory ligaments are “taught”
(bend less light)

close vision:
- ciliary bodies contract
- suspensory ligaments have more slack
(bend the light more)

Question 3

what is convergence

Answer 3

simultaneous turning of the eyes toward the nose in order for light to hit the macula

Question 4

what happens during pupil dilation

Answer 4

low light:
- iris dilates
- pupil gets bigger (letting in more light)

high light:
-iris constricts
-pupil gets smaller (letting in less light)

Question 5

what is the optic disk

Answer 5

• responsible for the blind spot (no photoreceptors and where all the neurons go)

Question 6

what is the optic nerve

Answer 6

• carries impulses to the brain

Question 7

what are cones (photoreceptor in retinal/neural tunic)

Answer 7

• provide color vision and require intense light

Question 8

what are rods (photoreceptor in neural tunic/retina)

Answer 8

• permit vision in dim light

Question 9

what is the fovea

Answer 9

• where photoreceptors are

Question 10

what happens if light is passed directly though the eye

Answer 10

• it will hit the macula (right behind pupil with sharpest vision and greatest amount of cones)