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Doctor insights on: Ishihara Color Vision Test

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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. Richard Bensinger
1,725 doctors shared insights

Vision (Definition)

Vision is a feature of a person's brain that allows him to see. He must have normal eyes, optic nerves (that stretch from the eyes to the back of his brain), and visual cortex (the vision center in the brain), in order to see properly. An ophthalmologist is a ...Read more


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Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Usually it is fine: You have defects in the central visual portion of your field of view - an area poorly outlined by most field testing devices. Field tests will define major defects which largely will register from the peripheral areas tested. Have you had a field tested in the past? Is there some condition being sought for with a field.? Your ophthalmologist would not order a field if he doubts the result. ...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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How are the eye doctors test for color blindness?

How are the eye doctors test for color blindness?

Color charts: Most eye doctors own an ishihara color vision test booklet which can be used to determine if you are color deficient. There are other booklets as well, color caps, and other more sophisticated means to determine the degree and type of color deficiency you might have. ...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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Before the color blindness test, how did doctors determine if people were color blind?

They asked them.: Since the color blindness tests have been around for at least a few hundred years, an ancient physician would just have had to ask. ...Read more

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What is impaired color vision?

Color mistakes: Mostly this is an impaired ability to recognize colors across certain color confusion axes. This is usually inherited and there is no treatment. It occurs mostly in males -7%- and also in females -1%-. But there are acquired forms in generalized retinal disease like diabetes or in optic nerve disease. Your ophthalmologist can sort this out. ...Read more

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How are eye vision test generally scored?

How are eye vision test generally scored?

Compared to standard: The chart used to test the eye is calibrated for normal vision at 20 feet. The outcome achieved is compared to what a normal eye can see at 20 feet. So if you can only see at 20 feet what a normal eye sees at 40 feet, your vision is considered to be 20/40. This is measured with and without corrective lenses at distance and at near. The vision with correction is considered to show the true vision. ...Read more

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When is baby`s skin color eye color hair color all determined?

When is baby`s skin color eye color hair color all determined?

At conception: When the sperm and egg combine their genetic material, the eye and skin color are determined. ...Read more

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How come black eyes don't cause permanent eye color changes?

How come black eyes don't cause permanent eye color changes?

The darkness of : Skin around the eyes that comes from bruising is eventually absorbed back into the body. ...Read more

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Hemochromatosis color blindness DNA testing influence, can you tell me?

What are you asking?: Can you clarify? Genetic testing for DNA isn't subject to much in the way of outside influences. Genetic work on colorblindness is available but we're not sure what to do with the data. The former is life-and-death. The latter is perhaps a target for gene therapy that will give fullcolor vision to those who haven't enjoyed it. ...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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Normal field vision test. Dilated optic discs small w/slight asymmetry. Suspicious oct scan. Eye pressure 27. Family history. Suspect for glaucoma?

Normal field vision test. Dilated optic discs small w/slight asymmetry. Suspicious oct scan. Eye pressure 27. Family history. Suspect for glaucoma?

Yes: It is important that your eye pressure be monitored closely and that the visual fields and oct are tested are a regular basis. I suggest you see an ophthalmologist regularly. There are usually no symptoms of glaucoma that you will experience. ...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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Do different color eyes alter a persons perception?

Do different color eyes alter a persons perception?

No! See Eye MD now.: Different color eyes usually genetic but can be a sign of inflammatory eye disease. See your eye md right away. ...Read more