A plus (+) sign next to the number refers to farsightedness correction.
A minus (-) is used to correct nearsightedness.
Right eye & Left eye
(OD, OS & OU)
Right eye & Left eye - OD is short for oculus dextrous which means your right eye, OS is
oculus sinister which means your left eye.
OU - short for oculus uterque which means the same values for both eyes
Distance vision & Near vision
(D.V & N.V)
Distance Vision - DV is the portion of your prescription which corrects your ability to
Near Vision - NV means your prescription is for reading only.
Measured in diopters, the number under this header refers to the lens power necessary
minus (-) is used to correct nearsightedness. A plus (+) sign next to the number refers
The lens power (also diopters) used to correct astigmatism. If you have no astigmatism
one, nothing will appear under this column. Just like with Sphere, minus is used to
for nearsighted astigmatism, plus is for farsighted astigmatism.
Like Cylinder, this only applies to astigmatism prescriptions. The numbers under this
angle degrees (1 to 180) and not diopters. If your prescription includes Cylinder lens
include Axis as well.
Only used for multifocal (progressive/bifocal) lenses. It refers to the added magnifying
to the bottom of the lens in multifocal lenses. PAL is used in some cases by eye doctors
addition for progressive lenses is different compared to bifocals.
The distance between your pupils in millimeters. If your prescription does not include a
PD, please leave it at 62 for single vision & progressives. For bifocals and reading
glasses, please provide the Near PD when applicable, otherwise you can leave it at 59.
You can also measure it manually.
Two PD Numbers
If your PD has 2 numbers (33/31 for example), the numbers indicate the distance between
the center of each pupil to the bridge of your nose. The first number is always for the
right eye, the second is for the left eye.
Means blindness in one eye. In this case put the same values for Both eyes (OD & OS).
The prismatic power needed to compensate for eye alignment issues (double vision or lazy
muscular imbalance. The prism Rx will have two values: PRISM & BASE - The base can go
Out. If there is a prism, it must have a base as well!
None, no values; You can have this value written in the sphere field, and still have
values, and vice versa.
Dr. Richard Williams, Jr
1234 Lower St. Bronx, NY USA
How to send a prescription
If you're still not completely comfortable filling out your glasses prescription
online, you can easily send us your prescription.
Watch the video below to see how it's done.
Watch the Video
This lens helps you see details at a distance. It is usually indicated by a (-) next to the
numbers under the “sphere” category of your prescription.
This lens is intended for seeing details at a close distance. Most commonly used for reading. It
is usually indicated by a (+) next to the numbers under the “sphere” category of your
Multifocal lenses include multiple lens powers for a number of viewing distances. It is
indicated in the prescription by the ADD power value, needed for reading.
Only prescription specifically for contact lenses can be used to order contacts, as the values
vary from eyeglasses prescriptions.