C.8.25.10 Keratometry Measurements Module
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#### C.8.25.10 Keratometry Measurements Module

Table C.8.25.10-1 defines the Attributes used to represent the keratometric measurements by a keratometer of a patient's eyes. Usually both eyes are measured, but sometimes just one.

Table C.8.25.10-1. Keratometry Measurements Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Keratometry Right Eye Sequence | (0046,0070) | 1C | A sequence that specifies keratometric measurements of a patient's right eye, defining principal meridians wherein the steepest meridian is separated by 90 degrees from the flattest. Only a single item shall be included in this sequence. Required if the right eye is measured. ### Note Consideration for steep, flat, and spherical meridians is made. For instances where spherical keratometric measurements are obtained, values specified in the steep and flat Attributes are equivalent. If Keratometry Right Eye Sequence (0046,0070) is present, Measurement Laterality (0024,0113), if present, will have a value of R or B as appropriate.
>Include Table C.8.25.10-2 “Keratometric Measurements Macro Attributes” |
Keratometry Left Eye Sequence | (0046,0071) | 1C | A sequence that specifies keratometric measurements of a patient's left eye, defining principal meridians wherein the steepest meridian is separated by 90 degrees from the flattest. Only a single item shall be included in this sequence. Required if the left eye is measured. ### Note Consideration for steep, flat, and spherical meridians is made. For instances where spherical keratometric measurements are obtained, values specified in the steep and flat Attributes are equivalent. If Keratometry Left Eye Sequence (0046,0071) is present, Measurement Laterality (0024,0113), if present, will have a value of L or B as appropriate.
>Include Table C.8.25.10-2 “Keratometric Measurements Macro Attributes” |

Table C.8.25.10-2 describes the attributes for the Keratometric Measurements Macro.

Table C.8.25.10-2. Keratometric Measurements Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Steep Keratometric Axis Sequence | (0046,0074) | 1 | A sequence that specifies the 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) | 1 | The refractive power of the cornea at the principal meridians, measured in diopters.
>Keratometric Axis | (0046,0077) | 1 | The meridian where the keratometric radius of curvature or power is measured, in degrees.
Flat Keratometric Axis Sequence | (0046,0080) | 1 | A sequence that specifies the 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) | 1 | The refractive power of the cornea at the principal meridians, measured in diopters.
>Keratometric Axis | (0046,0077) | 1 | The meridian where the keratometric radius of curvature or power is measured, in degrees.

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