Table C.8.25.6.2-1 specifies the Attributes of the Prism Sequence Macro.
Table C.8.25.6.2-1. Prism Sequence Macro Attributes
Attribute Name
Tag
Type
Attribute Description
Prism Sequence
(0046,0028)
1C
A Sequence that specifies prism that is measured in a lens, or that is required to correct for a patient's ocular misalignment.
Required if prism is measured in the lens or if this part of a refraction is done for a patient.
Only a single Item shall be included in this Sequence.
A prism is a wedge shaped lens that deviates light toward the base and shifts the apparent image toward its apex.
>Horizontal Prism Power
(0046,0030)
1
The power of a prism to bend light in the horizontal direction, in prism diopters.
>Horizontal Prism Base
(0046,0032)
Direction of the base of the measured prism -- either in (toward the nose), or out (away from the nose)
Enumerated Values:
>Vertical Prism Power
(0046,0034)
The power of a prism to bend light in the vertical direction, in prism diopters.
>Vertical Prism Base
(0046,0036)
Direction of the base of the measured prism -- either up, or down.