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Ophthalmol Case Rep 2017 Volume 1 Issue 1
August 21-23, 2017 | Toronto, Canada EYE AND VISION3rd International Conference on
During examinations of 23 subjects (12 in the control
group) in antiorthostatic hypokinesia (lying position
in experimental bed with -7o angle) of 2 months model
experiment “BedRest”, visual-manual tracking (VMT)
parameters were studied. In the study of VMT eye
movements were recorded by electrooculography method
(EOG), hand movements – by a joystick using biological visual
feedback (on the screen represented the current angle/
position of the joystick). Examinations were conducted
using computerized stimulation programs, which were
presented on the screen of the hardware-software complex
“Sensomotor” (smoothly linearly and sinusoidally on the
horizontal and vertical planes, with a 0.16 Hz frequency
in ±10° range). We analyzed time, amplitude and velocity
characteristics of the visual andmanual tracking (VT andMT),
including efficiency ratio and gain as ratios of respectively
amplitudes and velocities of eyes/hand movements to the
stimulus movement. Studies were carried out once before
the experiment (on 9-10 days before the bedrest - baseline
data collection), during the experiment on 3, 5, 10, 25, 40,
58 days of BedRest. After completion of the experiment,
examinations of VMT were carried out on 1, 3(4), 7-10 days.
According the results, during assessment of the parameters
of VMT it follows that antiorthostatic hypokinesia affects
not only on the characteristics of eye movements tracking,
as evidenced by an increase in the latency of reaction,
change in accuracy and velocity of visual stimulus tracking
but also changes in accuracy of important indicator of the
operating activity - manual tracking. Total reaction time of
the VT was significantly lower (!) than the BDC during stay
in experimental bed and in the first days after experiment,
same reaction we can see and after SF. It was found that
the conditions of antiorthostatic hypokinesia have a greater
impact on the accuracy of the VT than the accuracy of MT.
Full return of characteristics of the VMT to the baseline was
observed only on R+10 days after experiment. Comparison of
the results obtained at cosmonauts after long-duration space
flight, with the results of “BedRest” experiment showed the
similarity of character changes of measured parameters of
VMT, but changes after SF were more pronounced than after
«BedRest».
e:
Visual-manual tracking in antiorthostatic hypokinesia (“BedRest”)
Dmitrii O. Glukhikh
Ssc of rf – ibmp of ras, Russia, University caen basse, France