Cupping is a clinical sign that indicates that a large number of nerve fibers in the optic nerve have been lost. In this inheritance pattern, affected males always transmit their abnormal copy of the X chromosome to their daughters who are then carriersbut cannot pass the disease on to their sons. Incomplete penetrance The concept that even though several members of a family or population may have the same DNA mutation, not everyone with that mutation will have or develop the disease. Amblyopia : A typically monocular affecting one eye visual deficit caused by an abnormality of the neural connections between the eye and the brain that results from deficient or asymmetric input of visual stimulus during the first few years of life. In this test, a trained perimetrist moves the stimulus; stimulus brightness is held constant. Absence of eye deviation.
\ ˌȯr-thə-ˈfōr-ē-ə How to pronounce orthophoria (audio) \ : a normal condition of balance of the ocular muscles of the two eyes in which their lines of vision meet at the object toward which they are directed.
orthophosphoric acid. Orthophoria is a condition of binocular fixation in which the lines of vision meet at the object University of Michigan: Mosby.
ISBN ^ "Medical Definition of ORTHOPHORIA". Retrieved 11 February.
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Definition of respect_1 noun in Oxford Advanced Learner's Dictionary. used to praise somebody) see also self-respect opposite disrespect Oxford Collocations .
Variable expressivity The idea that individuals with a particular disease process will not each experience the same severity of disease. May be associated with excessive tearing. Anisometropia : A large difference in refractive error spectacle prescription between the two eyes. OCT measures the retinal nerve fiber layer thickness in glaucoma and other diseases of the optic nerve.
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This condition is extremely rare affecting fewer than 1 per million people per year and does not affect everyone who harbors the genetic defect. Congenital anomaly.
Starting at the outskirts of the fovea, however, rods gradually appear, and the absolute density of cone receptors progressively decreases.
Altitudinal often creates a horizontal line across the visual field (known as "respecting the horizontal meridian").
Glossary of Eye Terms Department of Ophthalmology and Visual Sciences
. Orthophoric: Proper alignment of the two eyes. The selective abnormality often creates a horizontal line across the visual field ( known as "respecting the horizontal meridian"). This is in contrast to variable expressivity which means that people with the same disease have Orthophoric.
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Protanomaly, protanomalous Partial color deficiency affecting the ability to see the color red. Therefore, a person who has tritanomaly will have a partial blue color vision deficit while a person who has deuteranopia will have a complete green color deficit.
Embryotoxon : Opacity of the inner most surface of the cornea at the periphery. Visual field testing A visual field test is an examination that may be performed to analyze a patient's visual field. Amblyopia Dullness or obscurity of sight for no apparent organic reason, therefore not correctable with glasses or surgery.
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Isopters in normal visual fields are oval in shape.
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|Aphakia Absence of the lens of the eye.
Cupping Disk cupping An enlargement of the cup or central depression in the optic nerve head. It consists of a series of color plates in which the test taker is asked to identify numbers or geometric shapes composed of specific colors that are hidden within a field of spots of very similar colors. Glaucoma, Normal-tension : Glaucoma in which the intraocular pressure is normal but there is progressive optic nerve damage and visual field loss. Incomplete penetrance The concept that even though several members of a family or population may have the same DNA mutation, not everyone with that mutation will have or develop the disease.