Question 1

what is the definition or description of: blind spot?

Accepted Answer

Optic nerve location: The physiologic blind spot is located about 15 degrees temporal to the midline in each eye. The reason for the blind spot is that there are no photoreceptors on the optic nerve. Your brain will fill that spot in with information from the other eye or with what it thinks is there. There are many websites that can help you explore this phenomenon if you google it.

Question 2

what is the definition or description of: color blind?

Accepted Answer

Color perception low: 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 significant and affect employment.

Question 3

what is the definition or description of: legal blindness?

Accepted Answer

See below.: This is a legal, not medical, term.  

A typical definition is visual acuity that is 20/200 or less in the best eye that has the best possible glasses or contact lens prescription in place, and/or constriction of the visual field to less than 10 degrees from centration in both eyes.

Note that the defintion requires that glasses or contact lenses be used when the vision is tested.

Question 4

what is the definition or description of: early blindness?

Accepted Answer

Early blindness: Early blindness - lack of sight or loss of sight early in life.

Question 5

what is the definition or description of: color blindness?

Accepted Answer

Color blindness: Color blindness = decreased  ability to distinguish btwn certain colors.

Question 6

what is the definition or description of: vision impairment and blindness?

Accepted Answer

Lowered vision: Vision impairment is the condition in which the corrected vision does not equal normal.  Blindness is a legal definition and may include 20/200 which is the limit for legal blindness in most States but there are various levels of blindness down to absolute blindness in which no light can be seen at all.

Question 7

how could someone make themselves blind?

Accepted Answer

Blindness: Self induced blindness is very rare and may be associated with mental illness.  Pressure on the eyes can result in central retinal artery occlusion.  Not controlling blood sugars in diabetes and not controlling hypertension can result in self inflicted blindness.  The real question is why would anyone make themselves blind? Psychiatric care should be considered.

Question 8

how should you know if you are colour blind?

Accepted Answer

Testing: The most common type of "color blindness" is red-green color deficiency. Blue-yellow deficiency or true color blindness (achromatopsia) are rare. Color testing can identify which. The problem is a lack of certain types of cones or their opsins (light-sensitive compounds). Red-green deficiency can be adapted to fairly easily and is not very limiting, but the others can significantly impact vision.

Question 9

what causes wavy lines and blind spotsvin vision ?

Accepted Answer

Depends: A common source of such phenomena is alterations in the health and architecture of the macula, the area of central sharp vision.  This can last a long time.  Temporary changes can occur due to migraines and vascular changes.  There are many other causes so if this is occurring, see your ophthalmologist for diagnosis.

Question 10

if a person is blind, what makes their irises dull?

Accepted Answer

Dull iris: Usually due to overlying corneal edema, casting a grayish haze over the eye color.

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What is the definition or description of: blind spot?

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What is the definition or description of: legal blindness?

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What is the definition or description of: early blindness?

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What is the definition or description of: color blindness?

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What is the definition or description of: vision impairment and blindness?

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How could someone make themselves blind?

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How should you know if you are colour blind?

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What causes wavy lines and blind spotsvin vision ?

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If a person is blind, what makes their irises dull?

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