THE RELATION BETWEEN THE ADAPTATION TIME IN THE EYE AND THE RATE OF VARIATION IN THE LUMINANCE1
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概要
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Tllis experiment was made to investigate tlle following two points : ( 1 ) That if the intensity of light is subdued, theadaption time in the eye will, or will not, make a difference by the illtenSity of pre-adapting light. If there is a difference, what is the degree of it? 2) When the ratio of the amount of variation in intensity to the intensity of pre-adapting light definedとlS the rate of variatioll in inteIISity, 1. e. VR, 1t Was presupposed that the I-eXt formula would hold :TA- K Log(1-VR), Where TA is the adaptation time, alld K is a constallt. The adaptation time after a change froln a intensity of light (pre-adapting light) to less illtenSity (adaptillg ligllt) was 111eaSured. (1 ) The relation betweell the intellSity of adaptillg light alld tlle adaptatioll tillle Was Showll in figure 2. From these results it was collCluded that if the intensity of pre-adapting or the adapting light is collStallt the adaptatioll time increases as the amount of change il一 intensity lncreases. (2) The relation between the rate of variation in intensity and the adaptation time was shown in figure 3. Froln these findings, it was concluded that when tlle rate Of variation of lulTlillOSity is ullder 999/1000 alld the rate is coIIStallt, the adaptatioll tillle also collleS tO al一 equal value, and the above formula hold. (3) From the results of experiment, an attempt was made to anticipate the adaptatioll tillle ill the gradtlal decrease ｡f the illtellSity. It was supposed tllat the adaptation time in the gradual changes of luminosity may he shorter than that in the installtaneOuS CllallgeS, alld if tile Speed of variation il一 lumillOSity lS too fast, the adaptation time may be loJlger.
- 信州大学人文学部の論文
- 1968-12-15