Explanation of Vision
When you are eye exam, an optometrist examines your eyes. Everything will be checked healthy and will record your recipe (if needed). The numbers written by them may seem confusing, but they help to make detailed illustrations, so here explains the recipe for glasses.
The first field you have written is Sph is a sphere and the number in the box below indicates whether you are long term or short-sighted and to what extent. If there is a plus sign before your number, then it shows that it is long-term and it's harder to see the things approaching. A small number like 0.25 means that it is only a bit long, but a big number like 6.00, it means it's very long-lasting.
If there is a minus sign before the number, this means that it is short-sighted and difficult to see distant things when you do not wear your glasses. Again, the number indicates the severity of its short-sightedness and tells the type of lens used by the glasses laboratory.
In the column next to Sph, the Cyl. This is on the cylinder and shows the amount of correction necessary to improve astigmatism. Astigmatism is an irregular curvature of eyes and an extremely common problem. If there is no number in this field, it means your eyes are perfectly round and have no astigmatism. If there is a number then that means your eyes are oval and your eyesight needs to be repaired.
If the number is small, it means your eyes are almost spherical. If the number is large, it means that your eyes are very oval and get more astigmatism. Whether there is any plus or minus does not matter because it only indicated how the optician looked at his eyes.
Next to Cyl you find the word Axis and this number is important in the lab that makes your glasses. It tells them at what angle the lenses should be placed in the frame and must be diffendent depending on their recipes. The number is not related to the power of the eye, but it makes sure the lenses are right.
If you are older than 45 years, a number may be added followed by Add. This is your reading supplement and tells the laboratory how much extra strength you have to print. Plus 1 would be adding a very low reading while the plus 3 would be a great deal. Vision is deteriorating with age, so it is important to pay attention to cataract, swim and age-related macular degeneration and other conditions.
The column next to the axis reads Prizma and is only used if your eyes are not even. The numbers start at 0.50 steps and if this column has a prism done, it must be taken to the lens. The last column is Base, and it tells the lab in the direction of the prism in its glasses.
Everyone's eyes are unique, so it is important to seize an eye examination and to regularly visit the optometrist for up-to-date medical prescription.
- Published On : 2 months ago on March 12, 2018
- Author By : 346@dmin
- Last Updated : March 12, 2018 @ 8:24 pm
- In The Categories Of : Uncategorized