How to read eye precription for eye glasses | How to read eye prescription

 

When someone visit to eye hospital for their eye check up and an optometrist prescribe them a number (eye prescription) to correct the vision, 

e.g., OD:-   -1.50 DS or  +1.50 DS / -0.75 DC * 150 or -1.00 DC @ 90

        OS:-   +2.00 DS or -2.00 DS / +0.75 DC * 50 or +2.00 DC @180

So what this number mean, here in this article we tell you how to read the prescription for eye glasses:

So as you see in the example, their are headings, including OD and OS, these are Latin: OD (Oculus dextrus) mean the right eye, OS (oculus sinister) mean the left eye and some time you may also see a notation for OU (Oculus Uterque) mean the both eye. 

The plus(+) and  minus(-) sign in front of numbers in the prescription have their irrespective mean, plus sign (+) in front of the numbers means you are farsighted and minus sign (-) in front of the number means you are nearsighted.

Numbers are represent the diopters which are are denoted by 'D', it is a unit which used to measure the focusing power of the lens. 

here we will understand the prescription through some examples:

1. + 1.50 DS

This mean you have one and half diopter of farsightedness. 

 

2. -1.50 DS

This mean you have one and half  diopter of nearsightedness. more the diopter less the vision. 

 

3. -1.00 DS / + 2.00 DC * 175

This type prescription show that you have astigmatism, in this type of refractive error prescription contains three numbers as S/C*Axis

Where 'S 'refers to Spherical portion, it is the degree of nearsightedness or farsightedness.

'C' refers to astigmatism, it can be negative or positive number as well, bigger the diopter, more astigmatism you have. 

Axis reveals the orientation of the astigmatism by the number between 0 and 180 degrees. 

So above prescription means that you have 1 diopter of nearsightedness with 2 diopters of astigmatism and an axis of 175 degrees.

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