RGB Color LED Lighting Improvable Eyesight Damage Caused by Presbyopia [通常講演]
佐野 勇司; Taihua Li; Naoki Komine; Yuki Fukai; Takuya Igarashi; Takahiro Arai
第4回中日韓照明カンファレンス, The 4th CJK Lighting Conference 2011年09月
We showed RGB color LED lighting is effective in shortening near point distance, which is increased by advance of presbyopia, in experiment results. We reproduced light, which has the same illuminance and chromaticity as from conventional lighting, using RGB color LED lighting. Near point distance which is the shortest visible distance in adjusting focus on object, was measured in a dark room. The experiment was carried out by 20 subjects, of men and women whose age range is from 20 to 70. The RGB color LED lighting was composed of red LED (wavelength:660nm), green LED (wavelength:527nm) and blue LED (wavelength:465nm), and 400 pieces of LEDs were arranged respectively.
Average near point distances of 20 subjects in using the RGB color LED lighting were shortened by 12.2% to natural white fluorescent lamp, by 11.6% to incandescent LED lamp, by 9.7% to incandescent lamp, by 6.13% to natural white LED lamp and by 5.44% to daylight fluorescent lamp respectively.
Moreover, we analyzed what shortened the near point distance. It is thought as cause that RGB lights from each color LED excited cones which have sensitivity for red , green and blue colors in retina effectively.