C.8.25.6 General Ophthalmic Refractive Macros
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C.8.25.6 General Ophthalmic Refractive Macros

C.8.25.6.1 Cylinder Sequence Macro

Table C.8.25.6.1-1 describes the attributes for the Cylinder Sequence Macro

Table C.8.25.6.1-1. Cylinder Sequence Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Cylinder Sequence

(0046,0018)

1C

A sequence that specifies lens measurements to correct for astigmatism or measurements of an eye that has astigmatism.

Required if astigmatic correction or astigmatism is measured.

Only a single Item shall be included in this Sequence.

Note

When astigmatism is present the power is NOT the same in all meridians, but has its minimum and maximum power in meridians separated by 90 degrees.

>Cylinder Power

(0046,0147)

1

The power that is present at the power meridian (90 degrees from the axis), in diopters.

>Cylinder Axis

(0022,0009)

1

The meridian, defined in degrees, that is 90 degrees from the power meridian.

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