An updated eyeglasses prescription is the first step to being able to buy stylish and affordable glasses online. Unfortunately, so few understand what is written on that piece of paper that it makes filling out the order form really difficult and often results in mistakes that end up causing errors in the manufacture of your new eyeglasses.
Learning what all those signs and symbols mean is crucial to you being in control of your visual health.
So let's get started with a very brief explanation of what the abbreviations on your prescription really mean:
OD is oculus dextrous which means your right eye
OS is oculus sinister which means your left eye
SPH is sphere - the main part of your prescription. It states the strength of your prescription in diopter.
CYL is cylinder - indicating the strength of your astigmatism (if you have one).
AXIS is the rotation of the cylindrical lens (CYL) that runs on a plane of 1-180 degrees.
PL is plano - which means there is no vision correction needed (basically you want frames fitted with clear glass lenses for fashion purposes).
D.V. means distance vision
N.V. means near vision - sometimes it says NVO
ADD is short for additional value
PD is the distance between your pupils or pupil distance
OU just means both eyes
PAL means progressive additive lens and it is the additional value for your progressive lenses.
Balance means that one eye has a prescription and the other eye has no useful vision.
X is short for Axis.
Prism happens when both eyes are not properly aligned and they need a prism to re-align them.
Base is the rotation of the prism. The prescription will read:
BO - base out
BI - base in
BU - base up
BD - base down
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