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Indicates the additional magnifying power applied to the bottom part of multifocal lenses to correct presbyopia.

The distance between the centers of the pupils, which is used to align lenses properly in the frame.

Represents the lens meridian that contains no cylinder power, indicating the direction of astigmatism.

Indicates the power of the lens prescribed to correct nearsightedness or farsightedness.

Prescribed to correct eye alignment issues and help with binocular vision problems.

Abbreviations used to describe the eyes to which the part of the prescription applies (OU - both, OD - right, OS - left).

Used in combination with prism prescriptions, specifies the direction in which the prism's thickest edge is oriented.