PeriData is an independant program. For data processing, we are dependant on the information and cooperation of the device manufacturers. Therefore, differences between the visual field representation by the device and by PeriData are possible.
The calculation methods for decimals may lead to rounding differences.
There are differences in the graphical display. Inside PeriData, the grayscale patterns, color defect patterns and defect symbols are uniform and comparable for all types of perimeters.
Some examination results are not sent at all. Kinetic examinations ("Goldmann Perimetry") are not sent by none of the perimeter types.
Concerning a specific perimeter, click on the link to get an information about the known differences:
Heidelberg Edge Perimeter (HEP)
Humphrey Field Analyzer
Medmont M700
Oculus Twinfield / Centerfield / Easyfield / Smartfield
Octopus
Rodenstock Peristat 433