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    Contrast Sensitivity Function v1.1 for iPhone, iPod touch & iPad

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CSF is KyberVision's 2nd mobile solution for vision care specialists which offers a quick and efficient way to assess the Contrast Sensitivity Function through an adjustment procedure on iPhone, iPod touch or iPad. Contrast thresholds are simply measured by adjusting a contrast slider until the stimulus is barely visible. This process is repeated a number of times for a range of spatial frequencies. A full CSF can be then obtained in just a couple of minutes and fitted with a standard model to derive the descriptive parameters of the CSF: peak frequency, peak sensitivity, bandwidth, cut-off frequency and DC attenuation.

KyberVision's CSF App has many features that are welcome in both clinical & research environment:

  • A variety of customizable visual stimuli (grating, Gabor, static or drifting)
  • Multiple stimulus configurations
  • A remote control mode (when installed on a secondary iOS device) through WiFi or Bluetooth
  • Enhanced contrast resolution
  • Gamma calibration
  • Automatic viewing distance monitoring using the front-facing camera
  • Data & subjects management
  • Exporting of sensitivity data through email in HTML with CSF plot as PDF attachment
  • Database backup & import through email with overwrite, append and merge capabilities


Version 1.1 (October 23, 2017)
- Compatibility with iOS 9 and above,
- Support for newer iOS devices,
- Improved communication in Remote mode over Bluetooth and WiFi.

Version 1.0 (March 9, 2013)
- First release on AppStore.