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Floater
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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.
RELATED TERMS--------------------------------------
Vision
The sense of sight.
Vitreous
The transparent, solid, gelatinous material which fills the interior of the eye behind the lens. It allows the eye to maintain its shape.
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
SIMILAR TERMS--------------------------------------
Floaters
Small condensations of cells in the vitreous body, the fluid in the eye, which cast shadows on the back of the eye, known as the retina. This is normally associated with aging. Floaters may indicate a more serious problem such as a retinal detachment. If you suddenly see a lot of floaters, please see your eye doctor.
Floating rib
One of the last two ribs. A rib is said to be "floating" if it does not attach to the sternum (the breast bone) or to another rib. There are usually 12 pairs of ribs in all. Each pair of ribs is attached to the building blocks of the spine (the vertebrae) in the back. The 12 pairs of ribs consist of: True ribs: The first seven ribs attach to the sternum (the breast bone) in the front and are known as true (or sternal) ribs and False ribs: The lower five ribs do not directly connect to the sternum and are known as false ribs. The upper three false ribs connect to the costal cartilages of the ribs just above them. The last two false ribs, however, usually have no ventral attachment (no anchor at all in front) and are called floating, fluctuating or vertebral ribs.
Floating-Harbor syndrome
A genetic condition characterized by the triad of short stature apparent at birth with significantly delayed bone age; expressive language delay, usually in the presence of normal motor development; and a triangular face with a prominent nose and deep-set eyes. Other features include posteriorly rotated ears, long eyelashes, thin lips, broad downturned mouth, short neck, low posterior hairline, celiac disease, joint laxity, curved fifth finger (clinodactyly), and hirsutism (hairiness).
PREVIOUS AND NEXT TERMS--------------------------------------
First-Order statistics
Captures differences in overall brightness.
First-Order motion mechanisms
Captures motion information from moving objects or features that differ from the background in luminance.
Fixation
Alignment of the eyes so that the image of the fixated target falls on the area centralis. For animals with immobile eyes the alignment of the head towards the fixated target.
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
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
The center of the fovea.
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.
RELATED TERMS--------------------------------------
Vision
The sense of sight.
Vitreous
The transparent, solid, gelatinous material which fills the interior of the eye behind the lens. It allows the eye to maintain its shape.
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
SIMILAR TERMS--------------------------------------
Floaters
Small condensations of cells in the vitreous body, the fluid in the eye, which cast shadows on the back of the eye, known as the retina. This is normally associated with aging. Floaters may indicate a more serious problem such as a retinal detachment. If you suddenly see a lot of floaters, please see your eye doctor.
Floating rib
One of the last two ribs. A rib is said to be "floating" if it does not attach to the sternum (the breast bone) or to another rib. There are usually 12 pairs of ribs in all. Each pair of ribs is attached to the building blocks of the spine (the vertebrae) in the back. The 12 pairs of ribs consist of: True ribs: The first seven ribs attach to the sternum (the breast bone) in the front and are known as true (or sternal) ribs and False ribs: The lower five ribs do not directly connect to the sternum and are known as false ribs. The upper three false ribs connect to the costal cartilages of the ribs just above them. The last two false ribs, however, usually have no ventral attachment (no anchor at all in front) and are called floating, fluctuating or vertebral ribs.
Floating-Harbor syndrome
A genetic condition characterized by the triad of short stature apparent at birth with significantly delayed bone age; expressive language delay, usually in the presence of normal motor development; and a triangular face with a prominent nose and deep-set eyes. Other features include posteriorly rotated ears, long eyelashes, thin lips, broad downturned mouth, short neck, low posterior hairline, celiac disease, joint laxity, curved fifth finger (clinodactyly), and hirsutism (hairiness).
PREVIOUS AND NEXT TERMS--------------------------------------
First-Order statistics
Captures differences in overall brightness.
First-Order motion mechanisms
Captures motion information from moving objects or features that differ from the background in luminance.
Fixation
Alignment of the eyes so that the image of the fixated target falls on the area centralis. For animals with immobile eyes the alignment of the head towards the fixated target.
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
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
The center of the fovea.
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.
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This dictionary contains 19186 terms.
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