PMID: 3750859Jan 1, 1986Paper

Contrast and phase processing in amblyopia

Vision Research
F Mac CanaW Lovegrove

Abstract

Contrast-coding was investigated in amblyopic, fellow non-amblyopic and control eyes. Using a contrast-matching paradigm similar to Georgeson and Sullivan [J. Physiol. 252, 627-656 (1975)], amblyopic eyes were found to have a high frequency contrast-coding deficit not only at threshold but also at suprathreshold levels up to at least 0.45 contrast. The results do not support the claim of Hess and Bradley [Nature 287, 463-464 (1980)] and Hess, Bradley and Piotrowski [Proc. R. Soc. Lond. B217, 309-330 (1983)] that amblyopes have normal or near-to-normal suprathreshold contrast-coding. By taking this contrast-coding deficit into account we demonstrate that previously reported poor phase discrimination [Lawden, Hess and Campbell, Vision Res. 22, 1005-1016 (1982); Pass and Levi, Invest. Ophthal. Visual Sci. 23, 780-786 (1984)] in amblyopia may, in part, reflect a more basic deficit in contrast-coding across spatial frequencies. The possible involvement of contrast processing mechanisms in phase discrimination is discussed.

References

Jul 1, 1979·American Journal of Optometry and Physiological Optics·E S Avetisov
Nov 30, 1978·Pflügers Archiv : European journal of physiology·R F HessT Greenhalgh
Jan 1, 1976·Vision Research·J J Kulikowski
Nov 1, 1975·The Journal of Physiology·M A Georgeson, G D Sullivan
Feb 1, 1974·Vision Research·J Atkinson, F W Campbell
Feb 22, 1983·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·R F HessL Piotrowski
Feb 22, 1983·Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character·R F Hess
Jan 1, 1984·Vision Research·D R Badcock
Jan 1, 1983·Vision Research·D M Levi, S A Klein
Jan 1, 1984·Vision Research·D R Badcock
Jan 1, 1982·Vision Research·M C LawdenF W Campbell
Oct 1, 1980·Behavioural Brain Research·I RentschlerH Brettel
Jan 1, 1980·Vision Research·D C Burr
May 1, 1965·The British Journal of Mathematical and Statistical Psychology·G B WETHERILL, H LEVITT
Jun 5, 1981·Science·L E LeguireM E Sloane

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Citations

Jan 1, 1988·Vision Research·W H SwansonH R Wilson
Jun 1, 1994·Vision Research·D C Kiper, L Kiorpes
Dec 6, 2002·Ophthalmology·Jaime H MembrenoGeorge R Beauchamp
Sep 13, 2013·Scientific Reports·Jiawei ZhouRobert F Hess
Nov 1, 1990·The British Journal of Ophthalmology·A Y Firth

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