The Authors have already described a micro-computer controlled Dynamic Refractometer with efficient alingnment device and proposed to use AA (Accommodation Area) as a measure to objectify visual fatigue. This paper reports on a small modification of the system and checks the validity of the method through two experiments.
The main results are as follows: (1) the method has potential ability to objectify visual fatigue, (2) the AA has a rhythm of a day similar to well known circadian rhythm which clarify the need of consideration in interpreting the AA, (3) CFF of positive display mode is higher by about 12Hz than that of negative mode, (4) the positive display mode CRTs seems better than that of negative display mode provided that their refresh rates are somewhat faster than their CFF levels.

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In this paper, the maximum horizontal velocities of smooth pursuit eye movements were experimentally investigated. The perceived retinal image generated from the apparent movement allowed us to determine the limiting velocities of smooth pursuit eye movements. The limiting velocities were identified by judging whether the perceived retinal image in a given condition was similar to that perceived when target velocity and eye velocity were identical. The limiting horizontal velocities of smooth pursuit eye movements were proportional to target amplitude, when target amplitude was less than 60 degree. When tracking a visual target, the target amplitude had a triangular wave form. The previously published results at maximum velocities of 30 and 90deg/sec are explained by this proportionality. The maximum horizontal velocity obtained in the experiment was 120deg/sec. The proportionality is not induced by both the apparent movement and periodicity of a visual target, but by an essential property of smooth pursuit eye movements.

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