C.8.26.2 Visual Field Static Perimetry Test Parameters Module

Table C.8.26.2-1 defines the Attributes used to represent the parameters used during a patient’s visual field test.

Table C.8.26.2-1VISUAL FIELD STATIC PERIMETRY TEST PARAMETERS MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Visual Field Horizontal Extent (0024,0010) 1 The maximum horizontal angular subtend (diameter or width) of the tested visual field, in degrees.
Visual Field Vertical Extent (0024,0011) 1 The maximum vertical angular subtend (diameter or height) of the tested visual field, in degrees.
Visual Field Shape (0024,0012) 1 The shape of the visual field tested. Defined Terms: RECTANGLE CIRCLE ELLIPSE
Screening Test Mode Code Sequence (0024,0016) 1C Mode used to determine how the starting luminance values and expected thresholds are chosen. Only a single Item shall be included in this sequence. Required if Content Item Modifier Sequence (0040,0441) within Performed Protocol Code Sequence (0040,0260) contains an item with the value (R-42453, SRT, “Screening”). May be present otherwise.
>Include ‘Code Sequence Macro’ Table 8.8-1 Defined Context ID is 4252
Maximum Stimulus Luminance (0024,0018) 1 Maximum luminance of stimulus, in candelas per square meter (cd/m²).
Background Luminance (0024,0020) 1 Background luminance of the device, in candelas per square meter (cd/m²). Note: This value is easily convertible to apostilb, which is used only in perimetry and is not a standardized unit.
Stimulus Color Code Sequence (0024,0021) 1 Color of light stimulus presented to the patient. Only a single Item shall be included in this sequence.
>Include ‘Code Sequence Macro’ Table 8.8-1 Defined Context ID is 4255
Background Illumination Color Code Sequence (0024,0024) 1 Color of the background illumination of the visual field device. Only a single Item shall be included in this sequence.
>Include ‘Code Sequence Macro’ Table 8.8-1 Defined Context ID is 4255
Stimulus Area (0024,0025) 1 Area of light stimulus presented to the patient, in degrees squared.
Stimulus Presentation Time (0024,0028) 1 The duration of time that a light stimulus is presented to a patient per each individual test point, in milliseconds. Note: This time is the same for each stimulus presentation.