eye anatomy & physio Flashcards Preview

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Flashcards in eye anatomy & physio Deck (27):
1

one of the only muscles of the eye with sympathetic innervation

muller's muscle

2

what is muller's muscle innervated by?

CN 3

3

which CN shuts the eye

CN 7

4

which CN keeps the eye open

CN 3

5

what makes the aqueous portion of the tears?

lacrimal gland

6

2 living layers of the eye

1, epithelium
2. endothelium

7

____ supplies blood to outer 2/3 of retina, and _____supplies blood to the inner 1/3 of retina

choroid; opthalmic artery

8

reduced or absent vision

scotoma

9

loss of half of visual field

hemianopia

10

loss of either right or left visual field

homoymous

11

lesion anterior to chiasm

ipsilateral monoocular loss

12

chiasmal lesion

bitemporal hemianopia

13

lesion posterior to chiasm

homonymous hemianopia

14

what is lens metabolism directed towrads?

maintenence of transparency

15

what is the main location of lens metabolism?

lens epithelium

16

where does glu enter the lens from/

the aqueous

17

when is the sorbitol pathway used?

normally only 5%, but when hyperglycemia, it is upregulated

18

can sorbitol diffuse out of lens?

no, it accumulates and creates an osmotic gradient for influx of H2O-->lens edema

19

if a person has a sudden change in refractive index?

then consider diabetes

20

tx for removing sorbitol from eye?

will be converted to fructose, and normalize over 4-6 weeks

21

what is the refractive surface of the eye?

cornea + lens

22

what represents 2/3 of the refractive power?

cornea

23

when refractive power of cornea/lens is different in 1 meridian than in another

astigmatism

24

hyperopia

farsighted

25

myopia

nearsighted

26

decreased ability to focus at near with age

presbyopia

27

can presbyopia be fixed?

no, cannot be halted with refractive surgery