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20 Cards in this Set
- Front
- Back
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Name the 3 walls/tunics of the eye
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1. Fibrous Layer (Sclera/Cornea)
2. Middle Vascular Layer (Choroid) 3. Inner Layer (Retina) |
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What part of the eye regulates the entry of light into the eye?
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Iris
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What part of the eye lends structural support to it?
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Vitreous body/humor
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What is visual acuity?
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Sharpness of vision
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What is myopia? Hyperopia? Emmetropia?
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Myopia - Nearsightedness
Hyperopia - Farsightedness Emmetropia - Normal Vision |
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What is an astigmatism?
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A visual defect produced by an abnormal curvature of the cornea or lens or by an irregularity in their surface
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What are cataracts and what causes them?
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Cloudy patches in a person's visual field caused by crystallin proteins changing shape and aggregate.
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What is accommodation?
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The ability of the eye to focus the images of objects at different distances from the lens.
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What is presbyopia?
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"Old eyes" - When the elasticity of the lens and the degree of convexity it can assume for near vision decreases with age
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What is glaucoma?
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When the drainage of aqueous humor is blocked and intraocular pressure rises
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What is nystagmus?
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When the tone of one muscle is weak as a result of muscle or nerve damage, the eyes will drift slowly in one direction followed by a rapid movement back to the correct position.
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What is the name of the device used to examine the inner part of the eye?
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Ophthalmoscope
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Where is the optic disc and what is it's significance?
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The region where the optic nerve exits the eye, blind spot
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What is the macula lutea and fovea centralis?
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Macula luteal contains the fovea centralis where the highest concentration of photoreceptors are found (cones).
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What are the two types of photoreceptors and what are they responsible for?
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Rods- night vision
Cones - color vision |
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How many and what different types of cones are there?
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3 - Blue, Green, Red
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How do sound waves travel?
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Outter ear (pinna & external auditory meatus) to the tympanic membrane (eardrum)
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Name the three ossicles of the ear
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Malleus (hammer), incus (anvil), stapes (stirrup)
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What is otitis media?
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Infection of the tympanic membrane
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What is the organ of equilibrium called?
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Vestibular apparatus
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