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Print this page on A4 (without scaling, at 100%. ) Use PD ruler at the bottom of the page. Recommend to use a physical PD ruler or consult your ophthalmologist
Note: The average PD is between 54 and 78mm. Might be a bit different compared to practical measurements. Please measure your PD 2-3 times to ensure you get the accurate results.
Step01
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Print PD Ruler
Print PD ruler at 100% size. Do not use 'scaling' or 'fit' setting. Print setting should be 'actual size'. Preview printable ruler
Step02
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Fold
Fold printout along the dotted line
Step03
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Mirror Or Friend
Stand 8 inches (20 cm) away from a mirror or a friend. Place & hozld the PD ruler against your brow. Keep your face straight
Ready. Set. Measure!
Take a few measurements for consistency. Most adults have a PD between 54 - 74 mm. Most children have a PD between 43 - 54 mm
Step04
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Align to Zero
First,close your right eye and align the ruler's zero to the center of your left pupil
Step05
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Open Right,close Left
Next,open your right eye and close your left eye
Step06
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Your PD
Look straight ahead and read the millimeter line that matches up with the center of your right pupil,this number represents your single PD in millimeters.
PD is the distance between your two pupils in millimeters. Having a correct PD on your glasses ensures that you are looking through the ideal spot in your lenses. If there is no PD on your prescription, you can check it with your doctor or measure it yourself.
SPH(Sphere)
Sphere(SPH) refers to the refractive correction in the prescription. Minus(-) values are for nearsightedness, and Plus(+) values are for farsightedness. If "PL" or "Plano" is written for the either SPH on your prescription, then you should select "0.00".
CYL(Cylinder) & Axis
Cylinder(CYL) refers to astigmatism. It can be either positive(+) or negative(-). Axis is recorded as an angle in degrees, between 0°and 180°. Therefore, if there is a CYL value on your prescription, then there must be an Axis for it.
If "DS" or "SPH" is noted for the either CYL on your prescription, it means you have no astigmatism.
ADD(Addition)
The number sometimes written as "NV" or "Reading Addition" refers to near vision and is used for multifocal lenses and readers.
Prism
Prism is power, measured in diopters, used to correct vision displacement, like double vision or an eye turn. Most eyeglass prescriptions do not have prism correction. A prescription with prism will have two values per eye: a Prism (power) and Base (direction).
Please confirm whether your prescription data matches. If it is correct, please click 'Confirm' to continue.
