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Philipp Hessler, Sophie Kersten, Josefine Dolata, Stephan Degle; Effects of Mono- and Polychromatic Light on Visual Functions at Near Distance. Invest. Ophthalmol. Vis. Sci. 2019;60(9):1799.
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© ARVO (1962-2015); The Authors (2016-present)
In modern interior lighting systems and displays, light color could be varied mainly to support the circadian rhythm. The aim of this study was to investigate the effect of different mono- and polychromatic light settings on visual functions at near distance.
In this study, right eyes of 38 subjects aged from 19 to 39 years (25.2 ± 3.9 years) were examined under five different light conditions. PHILIPS HUE LED bulbs were installed to illuminate a light box with red (615 nm) and blue (455 nm) light. Furthermore, different correlated color temperatures (CCT) were presented: warm-white (2700 K), neutral-white (4500 K) and cold-white (6500 K). Near phoria, smooth vergence parameters, minus lens stimulated amplitude of accommodation, relative accommodation and accommodative response were tested at a distance of 40 cm by using a phoropter (NIDEK SLY-100).
In red light, accommodative amplitude was lower (6.25 ± 2.0 dpt) than in blue light (7.75 ± 2.75 D, p<0.001). Moreover, positive relative accommodation was lower in red light (-2.75 ± 1.25 D) compared to blue light (-3.75 ± 1.75 D, p<0.001). Accommodative parameters in different CCTs of white light were found to be at the level of blue light. No differences in visual functions between different CCTs could be found. There were no significant differences in the results of near phoria, smooth vergence parameters, negative relative accommodation and accommodative response.
Short time exposure of different CCTs of white light does not influence accommodative and vergence parameters at near distance. However, red light reduced the amplitude of accommodation and positive relative accommodation compared to blue and white light. Further studies should investigate the long-term effect of different light colors on the visual system and the effect of light to support the therapy of accommodation and vergence disorders.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.
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