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6 Cards in this Set
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- Back
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Where do retinal vessels originate from?
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A pale circular region called the optic disk.
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What properties of the optic disk inhibit the sensation of the light from occuring? (At least 2 reasons)
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1) No photoreceptors found on the optic disk
2) Large blood vessels exist because the vessels cast shadows on the retina |
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Why is the macula the part of the retina for central vision?
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1) The macula is distinguished by the relative absence of large blood vessels thus improving the quality of central vision.
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Describe how the cornea is able to refract light
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Light coming into the eye is roughly parallel. Inside the cornea is aqueous humor which bends the light (which depends on the angle of curvature of cornea and [ ] of aqueous. Ultimately all light must converge at retina.
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Describe accommodation by the lens
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To focus the eye on a distant point, relatively little refraction is required, and it is provided by a FLAT lens (due to relaxation of ciliary muscles)
Near objects require greater refraction provided by a more SPHERICAL lens (due to the contraction and swelling of the ciliary muscles). |
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Name a simple optical procedure to check for signs of serious neurological disorder involving the brain stem.
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Connections between the retina and neurons in the brain stem control the muscles that constrict the pupils. This constriction and dilation is consenual; which means if one one is stimulated for pupil dilation the other eye must also dilate even if it wasnt stimulated...if it doesn't, this may be a sign of serious neurological disorder involving the brain stem.
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