[The detection of disparity evoked potentials in anisometropes].
OBJECTIVE
To investigate the affection of anisometropia on stereopsis and its mechanism.


METHODS
A new set of static random-dot stereograms was utilized as a stimulus to elicit evoked potentials in 20 anisometropes and 40 normal subjects.


RESULTS
Under the stimulus of different degrees of disparity in anisometropes, the P(250) waves related to stereopsis could be recorded. However, the percentage of their P(250) wave amplitude over the plane figure was significantly lower than that of normal persons (P < 0.05). The P(250) wave mean amplitude of severe anisometropes (aniseikonia >or= 5%) in fine disparity (14' and 23') was lower than that in mild anisometropes (aniseikonia < 5%, P < 0.05).


CONCLUSIONS
Anisometropia may affect and disturb the stereopsis. The degree of disturbance is related to the degree of anisometropia. The higher the degree of anisometropia, the lower the amplitude of the P(250) potential, and the main defect is at the part of fine disparity.
Hou
C
C
Department of Ophthalmology, First Teaching Hospital, West China University of Medical Sciences, Chengdu 610041, China.
Zeng
L
L
Yan
M
M
Fang
Q
Q
Shou
T
T
D000293:Adolescent; D000328:Adult; D000839:Aniseikonia / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D003867:Depth Perception; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015357:Vision Disparity / Q000502:physiology*