The influence of coloured lighting on ocular amplitude of accommodation

Abstract

The lighting systems that is used in our daily tasks are an important factor in our vision quality. These systems must be suitable to the visual needs required by these type of tasks.The aim of this work is to evaluate the influence of coloured lighting on ocular accommodation and quantify its response with the lighting used. Twenty subjects, with ages ranged from 18 to 26 years old, participated in the study. All subjects had 20/20 corrected visual acuity or better, normal colour vision and no history of ocular disease or surgery.The amplitude of accommodation was measured and compared under normal lighting conditions (assuming white LED light) and under coloured LED lighting tuned at peak wavelengths of 515 nm and 635 nm. Improvements over the reference light source on the parameters that were analysed will be identified and assumed as better lighting conditions (p>0.05).It was found a general decrease on the amplitude of accommodation when measured under coloured lighting and compared against the normal lighting. The most statistically significant decrease was found for the red light with a difference of 1.45D (p=0,05). Special care was taken to ensure same viewing and illuminance on all test conditions.These results seem to suggest that there is an impact of the colour of the lighting in use in the availability of the amplitude of accommodation.