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Foveola
Foveola The center of the fovea.
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Fovea
A central portion of the retina and macula that contains only cones. The fovea is the only part of the eye that is capable of 20/20 or better vision.
SIMILAR TERMS--------------------------------------
Fovea
A central portion of the retina and macula that contains only cones. The fovea is the only part of the eye that is capable of 20/20 or better vision.
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Flicker
Alternating levels of brightness.
Flicker photometry experiment
Stimuli consisting of a pair of different color test lights alternate. When the lights alternate slowly the pattern appears to change between the colors of the two lights. When the lights alternate rapidly observers fail to see the color modulation and instead perceive a dark-light modulation. Demonstrates that the temporal resolution for distinguishing blue-yellow is less than red-green which in turn is less than light-dark.
Floater
A blurry spot that appears to float around in the eye but does not block vision. The blur is the result of debris from the vitreous humour casting a shadow on the retina.
Focal length
Relates the distance between an image source and a lens and the distance of the lens to the image by the lenses focal length.
Focal vision
The role of vision involved in the examination and identification of objects associated with the fovea and exploratory eye movements.
Foveola
Full-Wave rectification
A signal which shows a positive response to both the positive and negative parts of a sinusiod (i.e. frequency doubling). Many complex cells show this to contrast reversing patterns.
Fibrin
A filamentous protein formed from the precursor fibrinogen by the enzyme thrombin.
Flocculent
Having downy or flaky shreds.
Friable
Breaks apart or crumbles easily.
Flashback
A recurrence of a memory, feeling, or perceptual experience from the past.
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