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what eye prescription is considered bad?

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13 views asked Feb 12 in Health by smyadmin

4 Answers

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Well, bad eyesight may refer to higher than a -6.00(600 degree) of myopia. From the result of your optical test, containing some terms and abbreviations, some numbers on your eyeglass prescription mean different but specify your prescription. "OD" and "OS" mean the "right eye" and "left eye". Sphere (SPH, amount of lens power), cylinder(CYL, amount of lens power for astigmatism), axis( added magnifying power) and prism( amount of prismatic power), both of which help to correct nearsightedness or farsightedness. In general, sphere, add and cylinder power will appear in diopters. Your degree is normal. I have -3.00 prescription eyeglasses, and go to my optician regularly to see some possible increase of the degree. In addition, the sharpness of our vision will decline with the deepening diopter, extended axial length and some fundus' pathological deterioration. As we all know, eye fatigue has a lot of eye health hazards. The more time you sit in front of your computer or TV, the higher your degree.
answered Feb 12 by Stephen M
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The international standard eye chart is 1.0-2.0. In fact, the standard eye chart is different in different countries.And different jobs have different limits on eyesight. You say that you need -1.5 that is to say you are nearsighted. But it is hard to say wether you have a bad eyesight or not. You can go to see a eye doctor, and let him or her give you a complete check.
answered Feb 12 by Elaina
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Well, for your situation, I have to say that you have bad sight, for you are near- sighted, and also have - 1.50 prescription eyeglasses. And when you suffer bad sight, it is very necessary to have eye glasses with certain prescription. So that you can just see things clearly. But on the other hand, if you want to correct your sight permanently, you should consider taking eye surgery, such as lasik eye surgery, which is designed to correct vision for near-sighted and far-sighted people. For details, you can have a talking with your eye doctor.
answered Feb 12 by Roxtar
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what prescription is legally blind?
I was wondering if it was possible to see what your vision is by your prescription.  My prescription is -7.5, I know I'm not 20/20!  Is there any way to say what I am?
answered Feb 12 by shanw413
"legally blind" in my state (Texas) is defined as having worse than 20/70 vision with the BETTER eye thru the best possible rx.  in other words, even with the best glasses or contacts on, your "good" eye is still not 20/70.  people tell me all the time that without their glasses on they are "legally blind".  thats not possible.  the definition of legally blind assumes you are wearing the best possible rx.

of course it is certainly possible to be worse than 20/70 w/o your glasses or contacts on.  if you really are -7.50, then you are certainly worse than 20/70 at distance (but i'm sure you read 20/20 if the print is close enough!).  so what is your actual acuity...  who knows?   20/1000?  thats just a guess.  here's how we do it in our office:

if you cant read the largest letter on our screen (20/400) at 20 feet, then i walk toward you holding up fingers.  as soon as you can tell how many fingers i'm holding up, then i write that distance down in the chart.  so if you correctly identified the number of fingers i was holding up at 3 ft, then i write "counting fingers at 3 ft".  most rx's over say -4.00 cant read the 20/400 letters w/o squinting.

there are of course more scientific ways, and someone could certainly quantify your uncorrected vision by showing you big enough letters.  but what would the point be, really?  just the shock factor, i guess.  unless you are a "low vision" patient (people with permanent vision loss who ARE legally blind and are worse than 20/70 in both eyes WITH their glasses on), then it doesnt really matter exactly how "bad" your vision is w/o glasses.  some professions require that you be a certain acuity w/o glasses...like fire fighters and police officers have to be 20/200 w/o glasses or contacts.  you are not 20/200 with -7.50.  again you are more like 20/1000.

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