OphthaTOP basic - Specifications
  • Placido cone: small cone optimized for ideal illumination, minimal influence of ambient light
  • Ring detection: detection of 30 ring edges with subpixel precision (10800 measurement points)
  • Illumination: high power visible light LEDs (white)
  • Calibration range: 6.5 to 10.0 mm calibration spheres (34-60 D); calibration for motion artefacts for all three dimensions
  • Camera: 40 FPS preview mode, high resolution 2 Megapixel snapshots
  • Working range: approx. 2 mm compensated for defocusing
  • Measurement area: approx. 9 mm diameter
  • Computer interface: USB 2.0
  • Electrical requirements: 100-250 V / 50-60 Hz
  • Software requirements: Microsoft Windows XP®
  • Repeatability* calibration sphere: ±0.05 D (SDM and MSD)
  • Repeatability normal human cornea: ±0.15 D (SDM and MSD)
  • Dimension: 38/38/52 cm (width/depth/height)

* based on ANSI Z80.23 draft; 0-7 mm diameter; SDM = standard deviation of the mean difference, MSD = mean standard deviation of differences