Table 1 Comparison of the basic parameters of the Heidelberg edge perimeter and ZERK1
From: Simplified automatic method for measuring the visual field using the perimeter ZERK 1
Parameter | Heidelberg edge perimeter | ZERK1 |
|---|---|---|
Confirmation of seeing the stimulus | Manual (button) | Automatic |
Measurement time (precise) | 3 min | 10 min |
Measurement time (rough) | – | 1 min |
Measurement area | Central 10, 24 and 30° visual field | Central 10, 24 and 30° visual field—but only in two axes |
Number of points | 100 | 190 + 135 |
Analysis of the duration of the eyeball response to a stimulus | – | √ |
Possibility of measuring the visual field in children | – | √ |
Possibility of measuring the visual field in bedridden people | – | √ |
Angular resolution | 1° | 1° |
Archiving results | √ | √ |
Possibility of displaying a multicoloured stimulus | – | √ |
Sensitivity | From 0 to 25 dB | From 0 to 25 dB |
Dependence of the results obtained on external lighting | – | √ |