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Influence of target direction, luminance and velocity on monocular horizontal optokinetic nystagmus
Author(s) -
Wang Ling,
Söderberg Per G.,
Tengroth Björn
Publication year - 1993
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.1993.tb04645.x
Subject(s) - optokinetic reflex , monocular , luminance , nystagmus , optometry , computer vision , optics , medicine , ophthalmology , eye movement , physics , audiology , computer science
. The present investigation demonstrates that the slow phase of human monocular horizontal optokinetic nystagmus (OKN) stimulated during scotopic vision does not depend on target direction but does depend on target luminance and velocity. OKN was elicited by a horizontally moving vertical grating projected inside a modified Goldman's perimeter hemisphere. Each of six target velocities (20, 40, 60, 80, 100 and 120 deg/s) were tested on each subject with step‐wise increased target luminance. Eye movement was recorded by DC EOG. Both right and left target directions were tested. It was found that there is no directional preference in OKN gain (slow phase velocity/stimulus velocity). For the target velocities 20–80 deg/s, OKN gain increases with increasing target luminance with an exponential decline. The exponential luminance constant increases as target velocity increases. The maximum OKN gain decreases as target velocity increases. The threshold luminance needed to initiate OKN increases with increasing target velocity. A linear relationship was found between OKN gain and target luminance for the target velocities 100 deg/s and 120 deg/s.