December 1982
Volume 23, Issue 6
Free
Articles  |   December 1982
Spatial processing of complex stimuli in the amblyopic visual system.
Investigative Ophthalmology & Visual Science December 1982, Vol.23, 780-786. doi:
  • Views
  • PDF
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      A F Pass, D M Levi; Spatial processing of complex stimuli in the amblyopic visual system.. Invest. Ophthalmol. Vis. Sci. 1982;23(6):780-786.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
This content is PDF only. Please click on the PDF icon to access.
Abstract

Thresholds for detection and discrimination of the polarity (phase) of repetitive gratings with a ramp luminance profile were compared to sine-wave thresholds in normal and amblyopic observers. In the high-frequency range (4 cy/deg), normal observers detected ramp-wave gratings when the contrast of the fundamental spatial frequency was close to its independent threshold and discriminated the polarity (phase) of the ramp when the second harmonic reached its independent threshold. For the amblyopic eyes, detection of the ramp also occurred when the contrast of the fundamental frequency was near its independent threshold. In contrast, discrimination of the polarity (phase) of the ramp required contrast levels 2 to 10 times greater than needed to detect the second harmonic. The reduced ability of the amblyopic eye to discriminate the polarity of the ramp represents an abnormality in phase processing and appears to be roughly proportional to athe reduced optotype acuity of the amblyopic eyes.

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×