March 1988
Volume 29, Issue 3
Free
Articles  |   March 1988
The effect of simulated scotomas on visual search in normal subjects.
Author Affiliations
  • J H Bertera
    Eye Research Institute of Retina Foundation, Boston, Massachusetts 02114.
Investigative Ophthalmology & Visual Science March 1988, Vol.29, 470-475. doi:
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      J H Bertera; The effect of simulated scotomas on visual search in normal subjects.. Invest. Ophthalmol. Vis. Sci. 1988;29(3):470-475.

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

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Abstract

A simulated scotoma was stabilized on the fovea of 23 normal human subjects while they searched for acuity targets in arrays of non-targets. Search time doubled with a 20 min arc scotoma, and eye fixation duration increased by about 15% when compared to no-scotoma control conditions. Search difficulty was graded by adjusting acuity target size, search element density and contrast. Search time and eye fixation duration generally increased with display difficulty in no-scotoma conditions. Results are discussed in terms of sensory loss and motor disruption due to the simulated scotoma. The simulated scotoma method may be useful in studying adaptation to visual field loss in patient populations where the size, position and severity of the scotoma can be controlled.

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