What do vision numbers mean?
An eye chart measures visual acuity, which is the clearness or sharpness of vision. The top number is your distance in feet from the chart. The bottom number is the distance at which a person with normal eyesight can read the same line. For example, if you have 20/30 vision, it means your vision is worse than average.
How do you read eye chart results?
Recording Snellen Results Top number equates to the distance (in metres) at which the test chart was presented (usually 6m), Bottom number identifies the position on the chart of the smallest line read by the ‘patient’. Eg; 6/60 means the subject can only see the top letter when viewed at 6m.
What does 0.25 mean on an eye test?
For example, if you have a sphere of -0.25, your vision is minimally affected. On the other hand, if your prescription starts at -5.00, you most likely have difficulty seeing at a distance without glasses. If the sphere indicates “Pl” or “Plano” for both eyes, it means that you do not suffer from myopia or hyperopia.
Does 20 30 vision need glasses?
If you have a 20/30 visual acuity score, you might see quite well, much of the time. But there may be times when your vision interferes with your quality of life. Someone with a score of 20/30 may have the visual acuity to do these things without glasses: Get out of bed and walk to the bathroom.
Is 1.75 A strong eye prescription?
If your number is between +0.25 and +2.00, you have mild farsightedness. If your number is between +2.25 and +5.00, you have moderate farsightedness. If your number is greater than +5.00, you have high farsightedness.
What is 0.5 on the Snellen scale?
You must also meet the minimum eyesight standard for driving by having a visual acuity of at least decimal 0.5 (6/12) measured on the Snellen scale (with glasses or contact lenses, if necessary) using both eyes together or, if you have sight in one eye only, in that eye.
What does 0.50 mean on an eye test?
Cylinder. The next number in the sample prescription is -0.50. This is the “cylinder” measurement. On your prescription, “cylinder” might be abbreviated as “CYL.” The cylinder measures the degree of astigmatism in your eye.
Is 20 30 vision near or farsighted?
A 20/30 visual acuity score means you need to get closer to see things, compared to others with normal 20/20 vision. These people can see an object, such as a road sign, at 30 feet. You will need to get 10 feet closer to see the same thing.