DICOM PS3.3 2021e - Information Object Definitions
C.8.25.16.3 Keratometry Macro

Table C.8.25.16-3 describes the Attributes for the Keratometry Macro.

Table C.8.25.16-3. Keratometry Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Steep Keratometric Axis Sequence

(0046,0074)

1

Steepest meridian as defined by the greatest power of curvature and shortest radius of curvature.

Only a single Item shall be included in this Sequence.

>Radius of Curvature

(0046,0075)

1

The radius of curvature of the principal meridians of the cornea, measured in mm.

>Keratometric Power

(0046,0076)

2

The refractive power of the cornea at the principal meridians, measured in diopters.

>Keratometric Axis

(0046,0077)

2

The meridian where the keratometric radius of curvature or power is measured, in degrees.

Flat Keratometric Axis Sequence

(0046,0080)

1

Flattest meridian as defined by the least power of curvature and longest radius of curvature.

Only a single Item shall be included in this Sequence.

>Radius of Curvature

(0046,0075)

1

The radius of curvature of the principal meridians of the cornea, measured in mm.

>Keratometric Power

(0046,0076)

2

The refractive power of the cornea at the principal meridians, measured in diopters.

>Keratometric Axis

(0046,0077)

2

The meridian where the keratometric radius of curvature or power is measured, in degrees.

Keratometry Measurement Type Code Sequence

(0022,1096)

2

Descriptors relevant to keratometry data.

Zero or one Item shall be included in this Sequence.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

DCID 4235 “Keratometry Descriptors”

Keratometer Index

(0022,1033)

2

The translation factor specific to each keratometer that derives a number for power from the measured radius of curvature of the cornea.


DICOM PS3.3 2021e - Information Object Definitions