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How do I read my prescription? |
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How do I read my prescription? |
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On a typical prescription, you will see two sets of rows. Most of the time top portion is for your OD or right eye while the bottom portion is for your OS or left eye.
For Distance correction, there should always be a value under Sphere and most of the time it is negative. Its abbreviation is 'D.V.' which stands for Distance Vision.
For Reading-only correction, there should always be a value under sphere and most of the time it is positive. If there is a value under Near Vision (N.V., N.V.O.) then enter the power in the BOTTOM half of the form and leave the ADD power blank or ("0.00").
For astigmatism correction, please note that that Cylinder (CYL) and Axis are always provided together. For any value of Cylinder there should always be a value for Axis. Some doctors use positive (+) cylinder and some uses negative (-), there is a big difference between the two so please pay close attention to the positive and negative signs. If you don't have astigmatism correction, doctors might just leave it blank or simply SPH or DS which means Sphere or Diopter Sphere. Axis should be from 1-180 degrees, if you see a value like '5' under axis, this is also the same as '005' or '5 degrees'. It should always be a whole number and there should be no decimal point on the axis.
For Bifocals and Progressive lenses, please check with your eye doctor whether the Addition is for Bifocals or Progressive. Most of the time, compared to the Bifocal Addition, the Addition of the Progressive is higher by 0.25, so please verify. An indication to know if your prescription is for Progressive is a PAL note written on the prescription; only one ADD means the addition for the Left and Right eyes are the same. Please be advised that we process a minimum of +1.00 and maximum of +3.00 for Addition powers.
Eye Doctors will sometimes leave out the decimal point on the Sphere, Cylinder and Addition. For example, -25 or +175, this is understood -0.25 and +1.75.
Very importantly, pay close attention to plus and minus sign as this will greatly affect the lens. If there is anything on the prescription you are not familiar, please call our Customer Service and we will be happy to assist you.
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Prescription will generally be laid out something like this: |
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Sph |
Cyl |
Axis |
Add |
| Right |
-1.50 |
-1.00 |
128 |
+2.5 |
| Left |
-1.25 |
-0.50 |
90 |
+1.5 |
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Sph |
Cyl |
Axis |
Add |
| Right |
-1.50 |
-1.00 |
128 |
+2.5 |
| Left |
-1.25 |
-0.50 |
90 |
+1.5 |
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| Right |
Sph |
Cyl |
Axis |
Prism |
Base |
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Sph |
Cyl |
Axis |
Prism |
Base |
Left |
| -1.50 |
-1.00 |
128 |
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Distance |
-1.25 |
-0.50 |
90 |
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| +2.5< |
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Near |
+1.5 |
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Some Prescription Samples as Follows: |
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Pupillary distance （PD) |
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PD for right eye PD for left eye |
Near Vision PD
Sometimes a prescription has two numbers, written such as PD 65/62 usually written on a bi-focal prescription. This means that 65 is your distance vision PD, and the one to be entered on our forms. And 62 is the reading or near vision PD, the one to be used only if you are ordering a plain reading glass only.
PD
The PD or Pupillary Distance is the distance between your two eyes , center to center, the center of one pupil to the center of the other, in Millimeters. Unfortunately most optometrists leave this quite necessary measurement off from your prescription, but you can measure this yourself.
You can measure this yourself in a mirror (not very accurate, and not generally recommended) or have a friend measure it for you by holding a ruler just under the pupils of your eyes and measuring the distance center to center. You should be looking straight forward fixing your focus at distant object, and not at the person measuring you.
Average is about 62mm, and most, 97% or so, fall within 54 to 74 range. If you are coming up with a number outside of this range consider that you might be making a measurement mistake. Do NOT just guess, or assume you‘re just an average 62,and DO NOT measure your old glasses to try to come with this number.
PD = Mono R +Mono L
Occasionally a PD is written as ,for example, 32/34.5 which are the measurements from the center of the nose to either eye, and your PD is the sum of the two, 32+34.5=66.5 (Mono R +Mono L = PD) and you can enter this as 66 or 67 it does not really matter.
If you are off by a millimeter or two it really does not matter, but try to be as accurate as you can especially for progressive prescription glasses.
You should also be able to get your PD from your previous eyeglass supplier, this figure does not expire with age, they have to give it to you by federal law as well as your full prescription, it is your property.
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