Effect of Fresnel prism dispersion on contrast sensitivity function.

  title={Effect of Fresnel prism dispersion on contrast sensitivity function.},
  author={George C. Woo and Fergus W. Campbell and Brian Ing},
  journal={Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians},
  volume={6 4},
Fresnel prisms are often used in orthoptics for binocular anomalies and in low vision for visual field defects. These prisms are made of optical polyvinyl chloride (PVC) and this material increases chromatic dispersion and produces a loss of contrast. In this study, the effect of chromatic dispersion on contrast sensitivity is determined. Contrast thresholds over a wide range of spatial frequencies are obtained on a number of subjects with the use of Fresnel prisms ranging from 5 to 30 prism… CONTINUE READING