PeriData is a separate program. For data processing, we are dependent on the information and cooperation of the perimeter manufacturers. Therefore, differences are possible. Further differences are arising from the calculation methods for decimals.
There are also differences in the graphical display. On the other hand, inside PeriData, the grayscale patterns, color defect patterns and defect symbols are uniform and comparable for all types of perimeters.
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