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18 Cards in this Set
- Front
- Back
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What is necessary to obtain binocular vision? |
The ability of the eye to fuse two images into one single image |
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Identify the normal visual field of two eyes from the text |
120• binocular 35• monocular each eye, 70• total |
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Define fusion and what is necessary to obtain fusion. |
Fusion is the power exerted by both eyes to keep the position of the eyes aligned so that the foveae project to the same point in space. |
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Define convergence |
Eyes turning in toward midline |
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Define the accommodation reflex |
Distance is the range of focus Near is the range of accommodation When the ciliary muscle is relaxed the lens is held tight and focused for distance |
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Identify the structures that aqueous humor leaves the anterior chamber through |
Trabecular meshwork Schlemms canal Aqueous veins |
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Identify the two main parts of the lens inside the surrounding capsule |
Cortex and nucleus |
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Identify scotopic |
Vision at night |
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With the Shirmers tear test after 5 minutes; 10 mm or more of wetting indicates normal function |
False, up to 10mm of wetting is normal function |
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Identify the vitamin related component of rhodopsin |
Vitamin A is the main component |
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What is normal Intracular Pressure |
Normal IOP is between 13-20 mm HG (millimeters of mercury). IOP can vary as much as 2-3 mm throughout the day |
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When a patients right eye is covered and it drifts in medially while the left eye takes up fixation it would indicate the right eye has; eso or eco and is it a tropia or phoria |
Eso- turned in Phoria- occasionally Esophoria |
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What range of vision does a normal eye see with the lens in its relaxed position |
Distance |
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What is the decline in ability to focus on near objects with age known as |
Presbyopia |
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This condition of losing ability to focus on near objects usually occurs at the age of |
45 |
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Clinically, persons with abnormal color vision fall into how many categories |
3 |
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The eyes ability to see color depends on 3 things |
Hue Saturation Brightness |
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Fusion may be disrupted and a phoria may be detected by placing an occluder over the eye or which instrument |
Maddox rod |
