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Doctor insights on: Tritanopia Color Blindness

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Whats ishihara color blindness test?

Whats ishihara color blindness test?

Color plates: The ishihara test plates are a series of dots of various colors with an embedded number or symbol which cannot be easily seen by the color deficient due to color confusion. They are the most commonly available test in ophthalmologists office although others are also available and some are better at separating the forms of color deficiency out. Ishihara is a good screening test. ...Read more

Dr. David Chandler
78 doctors shared insights

Color Blind (Definition)

Ophthalmologist prefer to use the term color deficit as blindness conveys other meanings. Lowered color perception can be inherited (many forms), can result from advanced loss of retinal cells, inherited retinal disease, and some forms occur due to CNS injury. There are excellent tests for the various types and they can be functionally ...Read more


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How is color blindness inherited?

How is color blindness inherited?

Sex linked: The most common form is carried on the X chromosome and so it manifests more commonly by far in males who lack a corresponding X (as women do ) to compensate (males have a sort Y chromosome). It is therefore passed on to a male child from his mother who carries a defective X (and most likely a normal X matching it so she is not color deficient.). ...Read more

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What causes color blindness?

What causes color blindness?

Mostly genertic: In inherited color deficiency, a visual pigment has its spectrum of color reception altered to a small degree and to a large degree in those with high degree of this disorder. The photoreceptor count is the same, so the acuity is not lost - just the color recognition. There are a few less common color vision losses due to advanced retinal, optic nerve and CNS diseases. ...Read more

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Is color blindness common?

Is color blindness common?

Sort of: About 8% of males and 1% of females have some degree of color perception dysfunction. So it is sort of common but not the majority. It is inherited so the family connection is important and can be traced. ...Read more

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What's deuteranopia and deuteranomaly, protanopia and protanomaly?

What's deuteranopia and deuteranomaly, protanopia and protanomaly?

Color defects: These are terms for inherited color deficiencies: deutero refers to red-green confusion and protan refers to yellow-blue confusion. Opias have absolute confusion and anomalies have partial confusion. ...Read more

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What is "impaired color vision"? Something like color blindness?

What is "impaired color vision"? Something like color blindness?

Color perception: Color vision can be altered in the usual way by inherited defects in the color perceptive elements of the retina. But advanced retinal disease like diabetes can impair color recognition; and changes in the color of the lens, and a few odd types of strokes and optic nerve disease all can alter color recognition patterns. Your ophthalmologist can sort this out for you. ...Read more

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Color blindness, is this normal?

Color blindness, is this normal?

Not quite: It is "normal" for those who have it. For those with actual normal color vision, it would be abnormal to lose it. ...Read more

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How does color deficiency differ from color blindness?

How does color deficiency differ from color blindness?

The same: Color blindness was the original term for conditions in which color recognition was impaired. Since "blindness" is a very charged termed, deficiency has been substituted as the politically correct term since most people with defects in color recognition are not blind at all. ...Read more

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Is color blindness reversible ?

May be : There two main kind of color blindness one genetic in nature and the other acquired, the genetic one is not revisable, the second in some cases it is. ...Read more

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Whats "impaired" color vision?

Whats "impaired" color vision?

Imperfect perception: Impaired color vision is when a persons color perception is more limited than a "normal". The degree of impairment is related to the degree of inability to distinguish color differences. There are good tests to make this determination. in your ophthalmologist;s office ...Read more

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Do color blind people lack cones?

Do color blind people lack cones?

No: Color blind people have a set of rhodopsin light receptive pigments that are shifted in spectrum, giving a narrower range of color perception. Except for a few very rare forms, they have a normal cone count and so their acuity is normal. ...Read more

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Can eye color change?

Can eye color change?

Unusual: Eye color change in adults can signal a specific type of glaucoma. But very often, it seems that the eye color lightens, but this is due to haze in the cornea that can come with aging. ...Read more

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Can red green color blindness cause headaches?

No: The eye adapts to this dysfunction and headaches might occur from other causes but not from the color deficiency. ...Read more

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Different color eyes genetic?

Different color eyes genetic?

Yes: The color of the iris is a pattern defined by a number of genes and it is the combination of these that leads to the color we see in the iris. The inheritance is not simple however, and prediction of color other than the browns, is tricky and unreliable. ...Read more

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What is color blindness ?

Color blindness: Color blindness is the inability to see certain colors adequately. This is an inherited condition (x-linked recessive) that affects men much more than women. The defect is in the retina and involves a problem with color sense in pigment granules. The commonest affect is trouble distinguishing red from green. See your doctor for an examination and proper treatment. ...Read more

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Lt.eye mac.pucker.Corrected vision 20/40 µpsia.Amsler grid nl.Corrected vision 20/40.Age 69.Could the macuar pucker cause micropsia?Rt. eye20/30.

Lt.eye mac.pucker.Corrected vision 20/40 &micropsia.Amsler grid nl.Corrected vision 20/40.Age 69.Could the macuar pucker cause micropsia?Rt. eye20/30.

Micropsia: Yes, it can if the macular pucker is severe enough. Micropsia is a condition in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema,macular degeneration, and more ...Read more

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How does color blindness be acquired?

Retina, optic nerve: Traditional color blindness is inherited, with 8% of men being red/green color blind. Acquired color blindness can be from any condition that affects the macula (macular degeneration and others) or the optic nerve (optic neuritis, or optic nerve atrophy). This is not red/green, but often the color red is poorly seen. Cataracts can filter out the color blue and cause yellowish vision. ...Read more

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How is color blindness treated?

How is color blindness treated?

Not possible: Most color blindness is inherited and permanent. A few are acquired from retinal global disease or a few rare strokes in the brain. No treatment is possible. ...Read more

Dr. Damien Luviano
64 doctors shared insights

Blindness (Definition)

Vision impairment and blindness are conditions in which a person cannot see well or see at all, even with glasses or contact lenses. If a person's best vision (with correction) out of either eye is only 20/70 - 20/200, he is impaired. If he can see no better than 20/200 or his visual field is no more than 20 degrees (severe "tunnel" vision), ...Read more


Dr. Tim Conrad
443 doctors shared insights

Loss Of Vision (Definition)

Loss of vision reflects the inability to perceive images. Such a phenotype can be due to occlusive or barriers to light (e.g. cataracts) through retinal alterations (e.g. wet macular degeneration) to optic nerve lesions (e.g. from a pituitary adenoma) to central nervous system ...Read more