Effect of optical defocus on the steady state pattern reversal visual-evoked response.

Abstract:

:The effects of optical defocusing with convex lenses on the amplitudes of pattern reversal visual-evoked response (PVER) were investigated. With the large check size and high-contrast pattern, PVER amplitudes showed a linear decrease in response to initial defocusing up to +5 to +6 dptr. As the degree of defocus increased, the PVER amplitude, though irregular, continued to show reliable, definite responses up to +25 dptr. With the intermediate check size and pattern contrast, PVER amplitudes displayed a linear decrease, but unlike the large-check/high-contrast condition, diminished to noise level after a defocus of greater than +4 to +5 dptr. From these results, we speculate that two phases in this function curve derive from the large-check/high-contrast condition: first, the contrast- or contour-dependent phase, and, second, the luminosity/movement-dependent phase.

journal_name

Ophthalmic Res

journal_title

Ophthalmic research

authors

Katsumi O,Hirose T,Sakaue H,Mehta M,Rosenstein RB

doi

10.1159/000267051

subject

Has Abstract

pub_date

1990-01-01 00:00:00

pages

383-90

issue

6

eissn

0030-3747

issn

1423-0259

journal_volume

22

pub_type

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