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August 1981

Quantitative Layer-by-Layer Perimetry: An Extended Analysis

Arch Ophthalmol. 1981;99(8):1473. doi:10.1001/archopht.1981.03930020347040

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This monograph describes a series of instructive and imaginative psychophysical experiments carried out during the past 15 years by Prof Jay Enoch, PhD, and his colleagues. The experiments deal with two subjects—(1) the effect of immediate surround on the perception of a flickering perimetric stimulus, and (2) a visual fatigue phenomenon, observed only in patients with retrobulbar optic neuropathies, in which a flashing stimulus becomes less easy to see with time. The authors marshall a large volume of evidence that with relatively simple tests they can distinguish lesions of the optic nerve from lesions of the inner or outer plexiform layer.

The first group of experiments constitutes the main body of the work. These experiments are modeled after electrophysiologic experiments in which receptor fields are mapped out that inhibit or facilitate the firing of a retinal ganglion cell. Here, instead of recording electrical responses, the authors measure a visual

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