C.8.25.6.2 Prism Sequence Macro
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##### C.8.25.6.2 Prism Sequence Macro

Table C.8.25.6.2-1 describes the attributes for 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. ### Note 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) | 1 | Direction of the base of the measured prism -- either in (toward the nose), or out (away from the nose) Enumerated Values: IN OUT
>Vertical Prism Power | (0046,0034) | 1 | The power of a prism to bend light in the vertical direction, in prism diopters.
>Vertical Prism Base | (0046,0036) | 1 | Direction of the base of the measured prism -- either up, or down. Enumerated Values: UP DOWN

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