If you visit your optometrist for a vision test, they can prescribe glasses depending on your condition. This prescription reveals key information about your eye health. However, the letters and numbers it contains can be hard to figure out the first time you see them. The guide below explains what they mean. 

Right and Left Eye

Glasses prescriptions often showcase two main headings, labeled as OD and OS. OD (oculus dexter) pertains to your right eye, while OS (oculus sinister) refers to your left eye. In some instances, you may also have a column designated for both of your eyes, labeled as OU (oculus uterque). Some optometrists opt to modernize their prescription by using RE (right eye) and LE (left eye) instead. 

Nearsightedness and Farsightedness

Below each heading are numbers that may indicate nearsightedness and farsightedness. A plus sign (+) in front of a number indicates that you are farsighted. This condition means that you see distant objects better than nearby objects. 

On the other hand, a minus sign (-) in front of the number reveals that you are suffering from nearsightedness. People with this condition have eye shapes that cause light rays to refract, making nearby objects appear clearer than those further away. The further the numbers are from zero, the more powerful your glasses need to be. For example, a prescription that contains a +1.00 indicates a small amount of farsightedness, while a +5.00 reveals a worse case. 

Astigmatism

Astigmatism is characterized by the imperfection in the curvature of the cornea or lens. People who suffer from this condition may notice three numbers in their prescription instead of just one. It is written out as S x C x Axis. For example, -3.00 +1.00 x 170. 

First in these three numbers is labeled S, standing for spherical. This is the level of nearsightedness and farsightedness, as discussed earlier. The second number is C (cylinder) which describes the degree of your astigmatism. A bigger number signifies a stronger case of astigmatism. Since astigmatism is related to the curvature of the cornea or lens, you'll need to know the orientation of astigmatism for the glasses to correct this. The last number, called axis, reveals this, written as a number between 0 and 180 degrees. 

Protecting your vision is essential for navigating the world around you. If you need new glasses, turn to Pal Optical in Lexington, KY. Serving Central Kentucky since 1956, they take pride in providing quality eye care services to help you maintain your eye health. Their expert optometrists. Dr Steven Klecker and Dr. Kathryn Robbins,  have access to cutting-edge equipment to check your corneas and retina, ensuring that your new prescription glasses fit your needs. Call them today at (859) 266-3003 or visit them online to learn more about their services.  Eye exam appointments can also call 859-269-6921