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Extra-small: 110 - 127 mm
Small: 128 - 134 mm
Medium: 135 - 139 mm
Large: 140 - 144 mm
Extra-large: 145+ mm
Extra-small: 100 - 114 mm; age 1-3 yrs*
Small: 115 - 119 mm; age 4-7 yrs*
Medium: 120 - 129 mm; age 8-12 yrs*
Large: 130+ mm; age 13-19 yrs*"
Sphere (SPH), or Spherical, refers to the refractive correction in the prescription. Minus (-) stands for near sightedness, and Plus (+) stands for Hyperopia and presbyopia . If "PL" or "Plano" is written for the either SPH value on your prescription, you should select a value of 0.00.
Cylinder (CYL), or Cylinder, refers to the strength of the correction for the astigmatism in the eye. This number also has (+) or (-). If there is a CYL value for an eye, there must be an Axis value for that eye.
Axis, Refers to the angle of the correction for the astigmatism in the eye (if one exists) from 0 to 180. If there is an Axis value on an eye, there must be a CYL (Cylinder) value on that eye. If there is no Cylinder value or if the value is zero, the OD Axis value is entered as 0.00.
Sometimes seen on your prescription as "NV, ADD, Near, Reading, or Reading Addition." "NV" stands for "Near-Vision." This number indicates the additional magnification that is added to the distance prescription to get the reading portion of the lens in a multi-focal prescription. We display a single NV-ADD field since it is almost always the same value for both eyes.
Pupillary Distance (PD) measures the distance between the centers of your pupils. This measurement is used to determine where you look through the lens of your glasses. in millimeters，PD should be included on your prescription.
If there is no PD on your prescription, checking with your eye doctor is recommended or you can measure it yourself. Learn How To Measure Pupillary Distance (PD)
DOWNLOAD UNIEOWFA PD RULERNote: Please Printed on A4.(without scaling, at 100%. )