What is GDV and what does it actually measure?

GDV is an optical method for capturing a light or corona-like phenomenon that appears around a fingertip during a brief high-voltage pulse. A camera records the pattern and software calculates different geometric and light-related features from the image.

What does the software see?

The software does not directly see a person's health. It first detects image characteristics such as area, intensity, uniformity, gaps, shape and distribution of the light pattern. Any further indicators are calculated models and should therefore be interpreted carefully and in context.

Why does repeatability matter?

Finger position, pressure, skin moisture, contact quality, camera settings and the environment can all influence the image. Meaningful comparisons therefore require a consistent capture procedure.