June 2013
Volume 54, Issue 15
Free
ARVO Annual Meeting Abstract  |   June 2013
Interocular acuity differences alter the spatial frequency tuning of stereopsis
Author Affiliations & Notes
  • Ashley Craven
    School of Optometry, University of California-Berkeley, Berkeley, CA
  • Truyet Tran
    School of Optometry, University of California-Berkeley, Berkeley, CA
  • Kevin Gustafson
    School of Optometry, University of California-Berkeley, Berkeley, CA
  • Thomas Wu
    School of Optometry, University of California-Berkeley, Berkeley, CA
  • Kayee So
    School of Optometry, University of California-Berkeley, Berkeley, CA
  • Dennis Levi
    School of Optometry, University of California-Berkeley, Berkeley, CA
    Helen Wills Neuroscience Institute, University of California-Berkeley, Berkeley, CA
  • Roger Li
    School of Optometry, University of California-Berkeley, Berkeley, CA
    Helen Wills Neuroscience Institute, University of California-Berkeley, Berkeley, CA
  • Footnotes
    Commercial Relationships Ashley Craven, None; Truyet Tran, None; Kevin Gustafson, None; Thomas Wu, None; Kayee So, None; Dennis Levi, None; Roger Li, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2013, Vol.54, 1518. doi:
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    • Get Citation

      Ashley Craven, Truyet Tran, Kevin Gustafson, Thomas Wu, Kayee So, Dennis Levi, Roger Li; Interocular acuity differences alter the spatial frequency tuning of stereopsis. Invest. Ophthalmol. Vis. Sci. 2013;54(15):1518.

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

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Abstract

Purpose: It is well known that interocular acuity differences result in reduced stereo acuity. However, previous studies have used tests that are broadband in their spatial frequency content. The purpose of the present study was to investigate the effects of interocular differences in acuity on the spatial frequency tuning of stereoscopic depth perception.

Methods: The visual stimulus consisted of two horizontally separated square blocks, one presented to each eye. Each block contained a Gabor target patch surrounded by four Gabor reference patches. Binocular disparity was introduced by shifting the two Gabor targets in opposite directions (controlled by 2 interleaved staircases), and a haploscope was used to enable binocular fusion. Stimulus spatial frequency ranged from 1-20 cyc/deg. The visual task was to determine the stereoscopic depth of the Gabor target (crossed disparity: in front of / uncrossed disparity: behind) relative to the four references. Five adult observers with corrected-to-normal vision were tested. Bangerter foils were used to reduce visual acuity in the dominant eye. Stereothresholds were measured for a range of acuity difference: from 1 to 8 letter-lines on a standard LogMAR letter chart.

Results: The stereoacuity versus spatial frequency function is basically the inverse of a typical contrast sensitivity function, with the optimum spatial frequency at 5- 10 cyc/deg. Increasing the interocular acuity difference degrades stereo thresholds selectively at high spatial frequencies, gradually shifting the optimum frequency to lower spatial frequencies. Interestingly, stereopsis for low frequency targets was only mildly affected even with an acuity difference of as much as eight letter-lines (0.8 LogMAR).

Conclusions: The current study shows that interocular acuity differences result in spatial frequency specific losses of stereopsis. These findings have important clinical implications for understanding both the sparing of coarse stereopsis and the deficits in fine stereopsis in anisometropic amblyopia.

Keywords: 495 depth • 754 visual acuity • 584 low vision  
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