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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