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Doctor insights on: Medicine For Legal Blindness

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Legal Blindness (Definition)

Legal blindness (20/200 in the us, 6/60 per the who) is defined as a) 20/200 or less visual acuity in the better-seeing eye with best correction, b) a visual field of 10 degrees diameter or less in its greatest meridian, or c) a combination of visual acuity and visual field loss equivalent to a or b. Anyone who says "you are legally blind without your glasses" is coercing you ...Read more


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What is legal blindness?

What is legal blindness?

Depends: Legal blindness has several definitions with some variation depending upon the state and the agency in question. Generally a corrected vision of 20/200 or less is legal blindness such as for income tax purposes. Generally a field of vision of less than 10 degrees is legal blindness. All these definitions are bilateral - a blind eye next to a normal eye is not legal blindness. ...Read more

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Is there any upsides to legal blindness?

Is there any upsides to legal blindness?

A few: If you are legally blind you will develop your other senses better. You will make different and sometimes interesting friends and most will appreciate your personality and wit. You will save money on eyeglasses and contact lenses. You will be eligible for tax discounts, public accomodations, and assistance for the handicapped. ...Read more

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What constitutes legal blindness in adult?

What constitutes legal blindness in adult?

20/200: Legal blindness varies with the jurisdiction but the two most common discriminators are a best corrected acuity of 20/200 in the best eye and/or a visual field with less than 10 degrees of extent in all directions in the better eye. Some also consider permanent doubling of vision in all directions of gaze to be legal blindness. ...Read more

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What is the definition or description of: legal blindness?

What is the definition or description of: legal blindness?

Even with glasses: Legal blindness (20/200 in the us, 6/60 per the who) is defined as a) 20/200 or less visual acuity in the better-seeing eye with best correction, b) a visual field of 10 degrees diameter or less in its greatest meridian, or c) a combination of visual acuity and visual field loss equivalent to a or b. Anyone who says "you are legally blind without your glasses" is coercing you to have lasik surgery. ...Read more

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Are there any side effects or risks to treatment of legal blindness?

Are there any side effects or risks to treatment of legal blindness?

Always: There are always side effects from treatment for any condition. It would probably be best to discuss the specific risks and benefits of your proposed treatment with your physician. Some forms of legal blindness are treatable while others, unfortunately, are not. ...Read more

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What drugs can cause blindness from overdosing?

What drugs can cause blindness from overdosing?

Some are illicit: Methanol can cause blindness, and anti-tb drugs like Ethambutol & rifampin. Steroids can cause glaucoma, antimalarials like Hydroxychloroquine can damage the macula. Talc retinopathy can occur with intravenous drug use. Direct retinal toxicity can occur from injected gentamicin. The precautionary principle demands withdrawal of potentially toxic drugs once diminished visual function is documented. ...Read more

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What abuse drugs can lead to blindness?

What abuse drugs can lead to blindness?

Powders & Potions: Wood alcohol (methanol) can contaminate moonshine whiskey and lead to rapid, permanent vision loss. Tobacco-alcohol amblyopia is a vitamin deficiency that may be partially reversible. Talc powder, as a contaminant of intravenous drugs, can cause capillary occlusion in the retina. Marijuana and hallucinogens alter the visual experience, but do not cause vision loss. Mj is good for glaucoma. ...Read more

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How does a hallucinogenic drug affect a blind person?

How does a hallucinogenic drug affect a blind person?

No idea: Not aware of any studies that have looked into this, and I know of no personal cases myself.
Hallucinogenic drugs alter sences and perceptions beyond just sight. And with any of these drugs effects can be unpredictable from one use to the next. ...Read more

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Can the drug hydroxycholoroquine also cause color blindness?

Yes 1st sign: When used in high doses as in treatment of malaria vision damage is frequent but in doses for lupus etc this is rare but color vision loss can be an early sign well before visual acuity damage. Reversal of damage can occur if stopped early. ...Read more

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Is there any type of surgery or medicine that can fix color blindness?

Not yet: But see the ted talk where someone with achromatopsia used sound to interpret color. ...Read more

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My sister was in a 'induced coma' for 12 days for drug overdose/liver-failure 6 years ago. After she woke she went permanently blind to this day, why?

My sister was in a 'induced coma' for 12 days for drug overdose/liver-failure 6 years ago. After she woke she went permanently blind to this day, why?

Liver failure: It's hard to say without knowing all the facts, but my guess is that she overdosed on tylenol (acetaminophen) and developed acute liver failure. When that happens, patients can develop cerebral edema and elevated intracranial pressure which can cause all sorts of neurologic impairments including blindness. ...Read more

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I've got dry eyes due to stevens johnson syndrome (drug-allergic).Will this dryness leads to blindness?

I've got dry eyes due to stevens johnson syndrome (drug-allergic).Will this dryness leads to blindness?

Not likely: Stevens-johnson syndrome targets the anterior surface ; mucous membrane of the eye which can result in severe dryness. This can be treated with artificial tears. Sjs can also damage the cornea ; corneal stem cells resulting in scarring of the cornea. It is the corneal changes that may decrease the vision. You should follow closely with your eye doctor for management to prevent vision loss. ...Read more

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Having a bloodshot is that bad? Am I going to get blind/eye cancer? No pain, swollen or itch on my eye, will it go away or is there any medicine?

Having a bloodshot is that bad? Am I going to get blind/eye cancer? No pain, swollen or itch on my eye, will it go away or is there any medicine?

Not going blind!: Sounds like a sub-conjunctival hemorrhage. As long as the vision is unchanged and there is no pain, everything should be fine. This is due to a blood vessel leaking blood and is usually without cause. Sometimes straining or blood thinner can cause this. If it continues to happen, follow up with eye md. Could be episcleritis, use artificial tears. ...Read more

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If I have a blind spot in my right eye, could it be treated (medicine/surgery)? Does working with computers/reading/crying. Etc, make it worse?

If I have a blind spot in my right eye, could it be treated (medicine/surgery)? Does working with computers/reading/crying. Etc, make it worse?

Depends on what the: Blind spot is. Everyone has a blind spot, but their brains are unaware of this blind spot. I assume this is not the blind spot you're talking about. If you actually see a blind spot in your vision, then you need to see and ophthalmologist immediately. Some of those things can be treated, but some of them cannot. You just want to make sure that it is something that's not going to get larger. ...Read more

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I drink plenty of h2o, excercise&eat right, good sleep. No drugs, booze or caffiene. Blinding migraines behind right eye. What else can I do to help?

I drink plenty of h2o, excercise&eat right, good sleep. No drugs, booze or caffiene. Blinding migraines behind right eye. What else can I do to help?

Accupuncture?: Have you tried seeing a migraine specialist? I've had patients who found relief through accupuncture - consider an evaluation by one in your area. Best wishes! ...Read more

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I have a blind spot (not the usual blind spot) due to high BP of the eye & low damage of the optic nerve, could it be treated by (medicine/surgery)?

Need to see a Doc: It is difficult to identify a blind spot and distinguish it from the "usual bind spot". Needs to be evaluated with retina and optic nerve examination and find out if any treatment would help. ...Read more

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How would the blind (in the u.S.) know if they are receiving the correct change in bills?

They don't: Here is the United States of america, we do not have a way to independently tell the difference between different denominations of paper currency. ...Read more

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What is the rate of occurrence of color blindness in the u.S.?

What is the rate of occurrence of color blindness in the u.S.?

About 8%: The standard statistics for inherited color deficiency is about 7.5% in males and 1/2 % in females. This can vary somewhat with different racial groups. The degree of color deficiency and the type are variable so your ophthalmologist can test you and see in which category you are if that is important to you and also give you information about your family possibilities. ...Read more

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What do blind people see?

What do blind people see?

Depends: Blindness is a general term. Legal blindness is a snellen visual acuity of less than 20/200 best corrected or a very small visual field. This is the big letter "e" on most charts.

A person with absolute blindness can not see any light. ...Read more

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Why are some people born blind?

Blind at birth: While prematurity leading to hyperoxygen retinal degeneration can severely impair vision, there are some other rare conditions that may completely impair vision including hypodevelopment of the eyes, cortical blindness, and various internal eye maldevelopments. You pediatrician can help sort these out and find the proper specialist for help. ...Read more

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Will I go blind as I get older?

Vision loss: Unless you have a primary problem with vision there is no reason to have visual loss as you get older. ...Read more

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Why do I go blind when I stretch?

Why do I go blind when I stretch?

Drop in blood pressu: Your blood pressure is dropping when you stretch, causing an alteration in vision. Either your blood pressure is low to begin with, or you may have a conditiion in which too much of your blood is going to your arms when you stretch, subclavian steel. I would talk to your primary doc about it. ...Read more

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What disease can make you go blind?

Many: The most common causes of blindness around the world include cataracts, macular degeneration, and glaucoma. Of those 3, cataracts are highly treatable. Improvements in vision with macular generation is largely limited to about 15% of cases which are the 'wet' form. Glaucoma damage is preventable but not restored with treatment. Parasitic eye disease (eg river blindness) occurs in the 3rd world. ...Read more

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How do blind people function so well?

Experience!: It takes time and practice. Blind people become expert at memorizing their surroundings so that they know, for instance, how many steps from the bed to the door. They listen carefully for echoes off of their footsteps. Many learn to use a cane to sense obstacles in their way. ...Read more

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Does being blind qualify you for disability?

Depends: Disability is defined by not having the physical and / or mental capacity to work. Vision is one component. It depends on your insurance policy, state and federal criteria and the potential demands on our job. They do have the right to see if you are trainable in another job. ...Read more

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Are blind people able to conceptualize vision?

Depends: If they are blind from birth, then there is probably no conceptualization of vision possible. If they acquired blindness, after the development of vision, then they will have a strong appreciation of vision and visual space. ...Read more

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Could contacts cause you to become more blind?

No: You are asking if contact wear can increase the power needs of the eye. They do not have this effect. You can wear them without this concern. ...Read more

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Why baby born blind? Why not marry to cousin?

Many causes: Blindness in newborns can be from a variety of fetal insults including infections of various sorts. There are also a number of genetic reasons for blindness. These can be increased with the marriage of first cousins which is why this is discouraged. ...Read more

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If you were born blind, what do you actually "see"?

Nothing if total: A completely blind person, unable to see any light at all, does not develop visual input or perception. All of the other sensory inputs work hopefully but a truly blind person sees nothing. ...Read more

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Is it possible for blind people to distinguish brightness?

Depends: There is legal blindness and absolute blindness. Anyone with some degree of visual perception can distinguish brightness but those absolutelyh blind cannot. ...Read more

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How is it that children could not take colour blind tests?

Who said so?: Children under school age do not all have the level of understanding to do the standard ishihara plates to screen for color deficiencies. Those that are older do. It is available (i can do it) but seldom requested. I don't believe I've had more than 1 or 2 requests in 3 decades. ...Read more

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How will I go through my daily routines while being blind?

How will I go through my daily routines while being blind?

With help initially: All states and the federal government offer substantial training for blind people to be able to function. There is usually no cost to you for these programs. Ask your ophthalmologist what is available in your state. If you are veteran, the va has a great program. Call them. ...Read more

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Do blind people really have keener senses than people who are not?

Do blind people really have keener senses than people who are not?

Not really: Blind people seem to have keener other senses because, without vision, they concentrate more on the other senses and use them to the fullest. They do not have keener senses, simply senses that they focus better upon. ...Read more

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What could cause someone to go blind for 10-20 minutes and then be back to normal?

Lots of reasons: Including ocular migraine, optic disc drusen, papilledema, impending retinal vascular occlusion, giant cell arteritis, etc. You must see an eye doctor for a dilated retinal exam. ...Read more

Dr. Damien Luviano
67 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
444 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