| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a visual acuity input method and a device capable of inputting by visual acuity at a gazing position in real time, which is easily set up, which gives less fatigue accompanying use of the device, capable of being used for a long time, which is less in malfunction by the change of environmental light and a motion of a subject capable of performing stable measurement, and by which natural sight is hardly obstructed. SOLUTION: The gazing position 3 of a subject 1 is calculated from a potential detector 12 to detect cornea retina potential 2 of the subject 1 and the cornea retina potential 2 detected by the potential detector 12 in real time by this operation controller 14. The relation between the cornea retina potential 2 and plural gazing positions is preliminarily calibrated and stored as an approximated straight line with fixed inclination and the gazing position 3 is calculated from the relation and the cornea retina potential 2 in real time by the operation controller 14. In addition, a fluctuated value of the cornea retina potential 2 at the same gazing position is found for every fluctuation and the cornea retina potential 2 is compensated by differentiating the fluctuated value. Furthermore, a fluctuation waveform of the cornea retina potential 2 is smoothed and rapid change of the gazing position due to a blink and rapid motion of an eyeball is reduced.</p> |
