VisionC

 

App for measuring the Visual Acuity and Contrast Sensitivity with dynamic Charts at multiple distances and for Normal or Low Vision Patients.

Normal Vision

  • ETDRS Charts for presenting at 0.40, 0.67, 0.80, 3 and 4 meters.
  • 3 Different packages of letters for avoiding memorization.
  • Contrast Variation from 0 to -2.3 log units in -0.1 log unit steps for measuring visual acuity at different conditions of contrast.
  • Isolated Crowded Sloan letters for measuring poorer visual acuity values than the limited for the screen size in an ETDRS chart.
  • Contrast Variation from 0 to -2.3 log units in -0.1 log unit steps for measuring contrast at a fixed value of visual acuity.
Instructions Healthy Subjects 

Low Vision

  • ETDRS Chart for presenting at 1 meter. From 0.2 to 1.1 logMAR [20/32 to 20/253]
  • Contrast Variation from 0 to -1.9 log units in -0.1 log unit steps for measuring visual acuity at different conditions of contrast.
  • Isolated Crowded Sloan letters for measuring poorer visual acuity values than the limited for the screen size in an ETDRS chart. Up to 1.6 logMAR [20/800]
Instructions Low Vision

Special Technical Issues

  • These issues makes the app the most proffesional in terms of personalization to maximize reliability.
  • Tablet's pixels per inch. The dots per inch (dpi) from your device is automatically recovered from the deviced and displayed in the screen (Possibility to change if the app is recovering incorrectly the dpi, particularly in android tablets.
  • Gamma correction. Optimize the contrast of the letters in your device by means of inserting your own calibration data.

 

This app will be early for Android

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