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vision 2
| Question | Answer |
|---|---|
| choroid | blood rich nutrients. vascular. Dark pigment prevents light scattering in eye. |
| ciliary muscle fx | control lens shape |
| ciliary body | secrete aqueous humor |
| iris | pigmented part of uvea |
| pupil | opening thru which light passes |
| pupil in distant vision | dilates |
| pupil in near vision | constricts |
| abducens (6) controls which mm and fx | lateral rectus, moves eye laterally |
| occulomotor (3) controls which mm and fx | medial rectus: moves medially superior rectus: elevates eye & turns medially Inferior rectus: depress eye and medially inferior oblique: elevate and lateral |
| troclear (4) controls which mm and fx | superior oblique: depress eye and turn laterally |
| rods and cones are found on: | neural layer of retina |
| where is high cone density | macula lutea |
| center of macula lutea is | fovea centralis, nearly all cones |
| cataracts | hard/opaque lens |
| lens (avascular) is nurished by the | aqueous humor |
| scleral venous sinus (canal of schlemm) | where aqueous humor is reabsorbed |
| photoreceptors are | rods and cones |
| dim light and gray tones | rods |
| color receptors and high visual acuity | cones |
| fx of horizontal and amacrine cells: | visual processing |
| optic chaism | decussation point for optic nerve |
| optic tracts | fibers after optic chiasm |
| refraction | bending of light rays as they pass from one medium to another. in visual field this is cornea, lens, and vitreous humor. |
| greater the lens convexity (bulge) | the more light is bent and the stronger the lens |
| the less the lens convexity (flatter) | the less it bends the light. |
| eye lens gets more convex (bulge) for | near vision (accomodation) |
| eye gets less convex (flat) for | far vision (emmetropia) |
| autonomic nervous system controls which mm of eye | intrinsic: ciliary body (curve of lens), radial and ciruclar mm of iris (pupil size). |
| convergence | medial eye movements for near vision, both eyes directed toward near object viewed. Extrinsic eye mm |
| somatic nervous system controls which eye mm | extrinsic |
Created by:
bre9656