Circular muscle ennervation by which system?
Parasympathetic system (M3 receptor)
Effect of ennervation of circular muscle
Stimulus of circular muscle
Stimulus of radial muscle
Which nervous system stimulates the radial muscle?
Sympathetic system (alpha-1 receptors)
Effect of ennervation of radial muscle
What type of vision is thin lens used for?
Lens ligaments linked to which muscle?
Ciliary muscle with basal tone
Effect of relaxed ciliary muscle
wide ring, ligaments in all directions, thin lens
Nervous system controlling distant vision-ciliary muscle
What type of vision is the thick lens for?
Effect of ciliary muscle fiber contraction
Smaller ring, less tension in lens, more gelatinous lens, fills more space, thicker lens
Which nervous system controls close vision focus?
Glaucoma is induced by?
Increased intraocular pressure
Effect of beta blockers on lens
Thick lens, free passage of fluids to drainage channels
Do systemic beta blockers affect the eye?
No because of BBB
What parasympathomimetics contract the ciliary muscle?
Pilocarpine, carbachol, echothiophate, physostigmine