In order to estimate objectively binocular vision and especially stereopsis, random dot stereograms generated by a personal computer were used. Brain activity during stereopsis was topographically studied by visually evoked potentials (VEPs). The potentials evoked by binocular viewing of patterns without disparity, e.g. correlogram, were very similar to the potentials evoked from patterns with disparity, i.e. stereogram, as many authors have already indicated. To derive the stereo-related potentials from the VEP elicited by stereograms, the potentials evoked by correlograms were subtracted from the potentials evoked by stereograms, and the differences of topographical distribution between normal and stereoblind subjects were investigated.
This study examined the effects on visual functions of a prolonged handling task within the helmet-mounted display environment. Both version eye movement and accommodative response became gradually slower during the 40-min task. Although delayed presentation of display after head movement noticeably worsened both visual responses, presentation delay after hand movement did not significantly change the sluggishness of responses. Therefore it is suggested that decreasing time delay after head movement is a more important factor in order to improve human performance of handling tasks within the HMD environment.
Moiré contour fringes were generated on the human corneal surface, following the instillation of a fluorescein solution onto the eye. The depth interval between the two adjacent moiré fringes was made to be 0.148 mm at all fringe orders by using a telecentric optical system. The meridional sections of normal and abnormal corneas were quantitatively profiled with an accuracy of about 0.005 mm. It was concluded that this corneal topography was advantageous, especially in determining the configuration of abnormal corneas, such as conical corneas and those that occur just after cataract extraction or corneal transplantation.
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