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Parts of a Prescription for Glasses
8
Flashcards
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CYL (Cylinder)
Reflects the amount of lens power needed to correct astigmatism.
PD (Pupillary Distance)
The distance between the centers of the pupils, which is used to align lenses properly in the frame.
Add (Addition)
Indicates the additional magnifying power applied to the bottom part of multifocal lenses to correct presbyopia.
Base
Used in combination with prism prescriptions, specifies the direction in which the prism's thickest edge is oriented.
Axis
Represents the lens meridian that contains no cylinder power, indicating the direction of astigmatism.
Prism
Prescribed to correct eye alignment issues and help with binocular vision problems.
SPH (Sphere)
Indicates the power of the lens prescribed to correct nearsightedness or farsightedness.
OU, OD, OS
Abbreviations used to describe the eyes to which the part of the prescription applies (OU - both, OD - right, OS - left).
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