It is measured in millimeters. The measurement makes it possible to ensure that when you get your glasses, you are looking through the right spot in your lenses. It is possible to take this measurement on your own if your eye care provider does not provide it. The average number is 62mm for women and 64mm for men.5 Nov 2018
What does SPH and CYL mean for glasses?
'Sphere' is basically a measure of how strong your prescription needs to be. The number marked 'axis' describes the orientation of astigmatism. It will be a number between 1 and 180. The number under 'cylinder' provides the lens power needed to correct the astigmatism.6 May 2020
What is a good SPH number?
An SPH number indicates if you are farsighted or nearsighted. If the SPH value is 0.00, or noted by Plano, Pl, or an infinity sign, you do not have a vision distance problem. Typical SPH numbers range between 0.00 and +/- 20.00.11 May 2020
What does sphere +0.25 mean?
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.4 Jun 2021
What is SPH and CYL and axis?
Your optical prescription Sph (sphere) represents how long or short sighted you are. This can be positive (+) for long sight or negative (-) for short sight. The higher the number, the stronger your lens. Axis indicates the direction of the part of the lens that corrects your astigmatism.
Is 0.25 eyesight curable?
There is no definitive way to permanently end shortsightedness just yet. However, prescription glasses, contact lenses and eye surgery are effective measures for improving eyesight.
What is lowest prescription for glasses?
The lowest strength is usually 1.00 diopters. Glasses go up in strength by factors of . 25 (1.50, 1.75, 2.00). The strongest glasses are 4.00 diopters.
What is a high SPH?
For the farsighted, the AOA classifies it this way: 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 does 1.25 mean for glasses?
1.25 reading glasses Reading glasses in the 1.25 range are for low to moderately-farsighted wearers. If strengths below 1.00 aren't adequate, lenses in the 1.00-2.00 range should do the job.4 Aug 2020