You should make an effort to know your glasses prescription, especially after your optometrist has given you a piece of paper containing some numbers. To an ordinary person, these numbers mean nothing but to a lab technician they provide some very useful information.
Refractive errors lead to blurred vision and an eye doctor will, after testing your eyesight, provide you with a prescription to help correct your vision. If you suffer from nearsightedness, then your vision will become blurred when you are trying to see objects at a distance. A farsighted person will be able to view objects at a distance without any problem but their vision will become blurred when they try to view objects that are close to their eyes.
The basic unit of measurement is a diopter. This measurement can either be positive or negative. A negative number shows that you are nearsighted while a positive number indicates that you are farsighted. A diopter shows the power of the lens needed to correct your vision. It is in fact the inverse of your focal length measured in meters. Focal length refers to the distance at which you can see things clearly at a short distance from your eyes.
If your prescription number is minus one diopter it means that you can see objects at a distance of one meter but if the object is further than one meter then your vision becomes blurred. If you are farsighted then a prescription measurement of plus one indicates that you can see objects clearly at one meter but if the object is closer than one meter then your vision becomes blurred.
Some people suffer from astigmatism. This is a condition in which your nearsighted or farsighted condition is not the same in every direction. This condition occurs because the corneas have lost their perfectly round shape and have irregular stretching. Astigmatism causes your vision to become blurry at all distances. This kind of problem can be corrected through cylindrical correction. On the other hand, when the eye doctor tries to correct your nearsightedness or farsightedness they use spherical correction because the correction occurs in all directions.
To know your glasses prescription you should also understand the meaning of terms like DV, OD, NV and OS. DV means distance vision. NV means near vision. OD stands for Oculus Dexter or Right Eye. OS means oculus sinister or Left Eye. Spherical is used to correct either farsightedness or nearsightedness. Axis describes the location of your astigmatism on a horizontal axis in your eyes.
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