Table C.8.25.6.1-1 specifies the Attributes of 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.
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)
The meridian, defined in degrees, that is 90 degrees from the power meridian.