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Definition
| The transparent dome-shaped anterior portion of the outer covering of the eye that covers the iris and pupil and is continuous with the sclera |
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Definition
| Situated behind the iris of the eye, it focuses light entering the eye into the retina |
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Definition
| The white part of the eye that, with the cornea, forms the protective outer covering of the eye |
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Definition
| The colored portion of the eye, a muscular diaphragm that controls the size of the pupil, which in turns controls the amount of light that enters the eye. |
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Definition
| An opacity in the lens that blocks light from reaching the retina |
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Definition
| loss of an entire eye's vision due to tumor or trauma that results from the disconnection of the optic nerve |
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Definition
| Blindness in one half of the visual field in one or both eyes |
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Term
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Definition
| Blindness in the other halves of the visual fields in both eyes, due to damage to the optic chiasm (Tumors are often the culprit) |
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Definition
| Blindness in the middle halves of the visual field in both eyes, due to damage to uncrossed fibers(often due to calcification of the carotid arteries, associated with hydrocephalus) |
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Definition
| Blindness in the same hemisphere of the visual field in both eyes, due to damage to one hemisphere of cortex(often from stroke or trauma) |
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Term
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Definition
| A deficit with scene perception, with normal visual fields |
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Definition
| A deficit in scene perception where the patient can only perceive one stimulus at a time. |
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Definition
| A deficit in scene perception where the patient can see multiple objects bu cannot recognize them (can navigate and count, but cannot read) |
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Term
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Definition
| A person whose cone photoreceptors in the retina cannot absorb light and therefore relies only on rod vision (Sees in black and white with low visual acuity) |
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Definition
| An Impairment of color vision in the entire visual field that arises from cortical lesions. |
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Term
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Definition
| The inability to perceive motion that arises from a stroke, trauma to v5/MT, and from antidepressants |
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Definition
| An inability to correctly see colors due to mutations in photoreceptors (e.g. medium-length cones mutated to response like long-length cones) |
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Definition
| A form of retinal colorblindness where either the green cones are missing completely or respond like red cones. It is much more common in males than females. |
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Term
| Blue-Yellow colorblindness |
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Definition
| A form of retinal colorblindness where people confuse blue with green and yellow with violet. It is very rare (roughly 1/10,000) and not sex-linked |
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