Abstract:
We investigated effects of artificial illuminance levels on the luminance contrast threshold of text and background on liquid crystal display (LCD) for the elderly with cataract. Five subjects were involved in the experiment. They determined the luminance contrast threshold of achromatic and chromatic red, yellow, green and blue stimuli under five artificial illuminance levels: 1, 10, 100, 300 and 1000 lux (lx) by using cataract-experienced goggles. The text and background stimuli had the same hue but different luminance. We established that the illuminance levels of 1 to 100 lx does not affect the way elderly with cataract and people with normal-vision read the LCD for both positive (C+) and negative contrast (C-) of red, green and yellow stimuli. However, the illuminance of 100 lx upward resulted in high luminance contrast threshold of C- of all stimuli for the cataract lenses. The achromatic and blue C- are affected by illuminance levels of 10 lx onward in the elderly with cataract.