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16 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Myopia |
Nearsightedness - When the cornea is too curved and the focus point when looking at far away objects end up anterior to the retina which result in a blurry picture. Close objects are still sharp. Reasons: Can be to many activities including focusing on close by objects but it can also be heridatory |
Eye |
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Presbyopia |
Farsightedness - The cornea stiffens up and looses its flexibility in a flattened position. Therefore the light will be focused on a point behind the retina which blurres out close by objects. Farsighteness is still preserved. This often happen due to age. |
Eye |
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The Fovea |
The very middle of the macula were the highest amount of cons are. This is where we percieve the most color and form. High visula acquity. Every cone is connected to an interneurons wereas in the case of rods there are many rods converging on one interneurons |
Eye |
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The Macula |
Also called the yellow spot. This is where the light passing through the lens is focused. This area is sensitive to short wavelenght light like blue and has high visula acquity. |
Eye |
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Aqueous |
Fluid in the eye filling up the space between the cornea and the lens. It is constantly replenished. |
Eye |
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Vitreous Humor |
See-through gel-like fluid in the eye which hold up the eye ball. It often gets cloudy with age and can get spots in it which can be seen as obstructions in the visual field. |
Eye |
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Optic Disc |
Also called the Blind-spot. This is where the retinal ganglion cells leave the eye and goes into the optic nerve. |
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Interneurons x3 Name them |
These are the neurons that are inbetween the cons and rods and the retinal ganglion cells. - Bipolar cells - Amacrine cells - Horizontal cells |
Visual perception |
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Saccades |
REM to shift focus from one point to another as to bring a stumuli into the centre of focus (fovea) |
Eye behavior |
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Microsaccades |
During fixation with our eyes a miniture movements is produced. Function: |
Eye behavior |
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Optic Ataxia |
Recognizes objects but can't use visual cues to guide their actions. Eye movements may be directed inappropriately so that objects are not brought into the sight of the fovea. Correlated with leasion in the parietal cortex. |
Neurological disorder that effect vision |
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Ventral right attentional network |
Ventral frontoparietal attention network. Correlates: TPJ + VFC(I & MF gyri) Strongly lateralized to the RH. - Stimulus Driven attention - Detection of salient targets (especially unexpected) - Reorientation of attention TPJ- Target detection Lesions TPJ = deficit in disengaging spatial attention |
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Dorsal attention network |
Correlates: IPS (Intraperietal Sulcus) - Maintanence of attention - Visual searching |
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Superior colliculi |
Input from: Output: Thalamus Detect and guide eye movement towards salient stimuli PSP prgressive superneuclear palsy = degeneration of Superior Colliculi = difficulty shifting attention |
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Akinetopsia |
Loss of motion perception due to damage to V5 |
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Achromatopsia |
Loss of color vision due to damage to v4 |
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