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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