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Flashcards in The Eye and Glaucoma Deck (17)
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1

Circular muscle ennervation by which system?

Parasympathetic system (M3 receptor)

2

Effect of ennervation of circular muscle

Contration-miosis-smaller pupil

3

Stimulus of circular muscle

Bright light

4

Stimulus of radial muscle

dim light

5

Which nervous system stimulates the radial muscle?

Sympathetic system (alpha-1 receptors)

6

Effect of ennervation of radial muscle

Contracts-mydriasis-dilates/widens pupil

7

What type of vision is thin lens used for?

Distant vision

8

Lens ligaments linked to which muscle?

Ciliary muscle with basal tone

9

Effect of relaxed ciliary muscle

wide ring, ligaments in all directions, thin lens

10

Nervous system controlling distant vision-ciliary muscle

Sympathetic NS

11

What type of vision is the thick lens for?

Close vision

12

Effect of ciliary muscle fiber contraction

Smaller ring, less tension in lens, more gelatinous lens, fills more space, thicker lens

13

Which nervous system controls close vision focus?

Parasympathetic NS

14

Glaucoma is induced by?

Increased intraocular pressure

15

Effect of beta blockers on lens

Thick lens, free passage of fluids to drainage channels

16

Do systemic beta blockers affect the eye?

No because of BBB

17

What parasympathomimetics contract the ciliary muscle?

Pilocarpine, carbachol, echothiophate, physostigmine