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how bad is my eye prescription?

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(eye prescription) Are my eyes bad?
Today I went to my eye doctor for a check up
and I received an eye prescription that says:

Sphere _____________ Cylinder _______________ Axis
OD -2.25 _____________ -3.25 ________________160
OS -2.75 ______________ -3.00__________________ 20

Are my eyes bad, and I do not understand what OD, OS, Sphere, Cylinder and Axis mean on this prescription....

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eye prescription good or bad

asked Feb 12, 2017 in Health by smyadmin

3 Answers

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You are nearsighted and have astigmatism. O.D. is your right eye, O.S. is your left eye. Sphere is the correction for nearsightedness and cylinder corrects for astigmatism.

Astigmatism is an irregular curvature of the eye--its less round and shaped more like a football (its very common). Astigmatism causes you to see things somewhat distorted. You know that weird curving you get in new glasses--that is the correction for astigmatism. You see walls as curved but your brain nows that's not possible so it tries to straighten it out for you. Then when you get glasses to correct for astigmatism your brain is still compensating and you see that curved affect until your eyes adjust to the correction. Axis is the degree of your astigmatism is set at (180 is the highest).

And yes your eyes are somewhat bad. Sorry. Anything above a -3.00 in sphere is starting to get up there. And anything above a -1.00 is considered high for astigmatism.

To make things simpler when referring to your prescription you would add the sphere and cylinder powers together to get what is known as total power. Total power for your right eye is -5.50 and your left is -5.75. you can just round off even further and just say you total power is about -5.50 when talking about your prescription.

One more thing, you would say your prescription its "minus five fifty, total power" rather than "negative five point fifty." (positive and negative is for math not optics)

But while your prescription is a bit up there, it isn't until minus 8 or 9 or higher that its considered really bad. Prescriptions of minus 15 or 20 are very rare.

answered Feb 12, 2017 by doorhingeorange
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How bad is a -4.00 eye prescription?
I had my eye exam today and that's what my optometrist filled out on the sheet for new lenses. I was wondering if that was really bad (poor vision). I am nearsighted. Also, can someone give me that in the Snellen fraction?
answered Feb 12, 2017 by shery
This prescription would be what I would call moderate in amount. Don't get me wrong. With this amount of nearsightedness you definitely have significant vision clarity issues, but I have patients in my practice with -15.00 and more. More than you actual prescription is involved in what your resultant visual acuity is but I would estimate you would have somewhere around 20/400 visual acuity.
Me. I am an optometric physician.
When light rays pass through a lens, one that is thick in the center and thin on the outside, the central light ray goes straight through, undeviated. The light rays away from the center are bent, and they all cross that central light ray some distance away from the lens. That distance is called the focal distance and the more powerful the lens, the closer the focal point is to the lens itself.

The formula for this is P=1/d where d is in meters.

So a lens that focuses light 1 meter away would be a +1.00 lens.
A lens that focused light a half meter away would be a +2.00 lens.
third of a meter away, +3.00.
Quarter of a meter, +4.00
tenth of a meter, +10.00.

your eyes are too powerful. They are +4.00 too powerful, so you need a -4.00 lens to "neutralize" the power of your eye's lens system which is made up of your cornea (the clear part in the front through which you can see the blue or brown or green or hazel, or gray or ? part) and the lens itself.

So you can see a quarter of a meter in front of you really well, just beyond that, not so good.

Once you've corrected your too powerful eyes by moving your focal distance out to infinity, your vision should be 20/20 which is 'normal'. It does no good to say the camera takes lousy pictures if you don't bother to focus it.

The Snellen equivalent would be how well you see compared to 'normal' which would be less at 20 feet because you aren't focused at twenty feet, you are focused at about 10 inches or about a quarter of a meter (a meter being 39.something something inches).

If you can only see the 400 foot letter, you are 20/400. One is a measure of the optical power, the other a measure of the seeing power of your eye, assuming you don't have anything else 'wrong' with your eye such as a cataract, hemorrhage, nerve disease, macula disease, vascular disease, leaking, drying.....
yawn.... I know, I know...
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How bad is my eyesight? -4.00 and -3.50?
I know I have bad eyesight.. But I was just wondering.

What these numbers mean?

It says: Right: (sphere) -4.00 (Cylinder) -.25 (axis) 80
Left: (sphere) -3.50 (cylinder) -.25 (axis) 105

Can somebody please explain what's good and what's bad?

These are my eyeglasses, and I'm 17. I dont know if that has anything to do with if its good or bad haha.
Update: I already have glasses and contacts. I was just wondering how bad my eyesight is haha.

Where does the 20/20 vision come in? is that the 80/105 that I have? or am I way off..
answered Feb 12, 2017 by cabaniss
The -4.00 in your right eye and -3.50 in your left eye are the actual prescription for your glasses-those numbers indicate how "bad" your eyesight is. It's not too bad, the higher the number the worse your vision. 8.00 or above is considered legally blind. The minus (-) sign indicates that you have myopia, or nearsightedness, which means you can see things that are close to you but your distance vision is blurry. A positive sign (+) would indicate hyperopia or farsightedness, which is the opposite (you can see objects in the distance clearly, but can't see objects that are close to you). The other numbers -.25 axis 80 and -.25 axis 105 indicate that you have astigmatism. In short, this means that your eyes are shaped differently (the curve of the cornea, or front of your eyeball). The prescription for astigmatism in your glasses corrects any focusing problems caused by the shape of your cornea. Again, not a real bad thing, many people have this problem. Your eyesight may stay the same or get worse as you get older. The majority of people need bifocals (for both myopia and hyperopia) when they reach the age of 40 or so, this is pretty normal. Most people do not have perfect vision, I would say your eyesight is about average among people who have glasses or contacts (mine is about the same as yours). Most people also have a weak eye and a dominant eye, which accounts for why your prescription is different for each eye.

20/20 refers to "visual acuity," which is determined by what size letters you can read on the eye chart from a certain distance. 20/20 is "perfect" vision, and basically it means you can see small letters or detail from 20 feet away. It is possible to have 20/40, 20/80, 20/100 etc., up to 20/200. The higher the second number, the worse your vision is. Think of the second number as the font size you can read. People who can read size "20" font (which let's say for the purpose of this example is very small) from a distance of 20 feet, have 20/20 visual acuity. On the other hand, someone who has 20/100 or 20/200 visual acuity can only see larger "font sizes" like 100 or 200 sized-font from a distance of 20 feet. These numbers for visual acuity are what optometrists use as a starting point to determine roughly what prescription you need in your glasses/contacts.
Worked at Lenscrafters optometrist's office
Its nothing about good or bad as such.

You have both cylinder and spherical power. Cylinder is low but spherical is pretty high. This is certainly not good at your age. As our age advances eye power increases the later it begins the better.
Generally Cylinder power is for clarity and having both Cylinder and spherical is not really good.

I would suggest you to have carrot juice and do a simple eye exercise where you close your eyes and move eye balls up, down, left and right.
I wear glasses.

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