Abstract
BackgroundMyopia is hypothesized to be influenced by environmental light conditions. For example, it has been shown that colour and temporal frequency of flickering light affect emmetropisation in animals. Considering the omnipresence of flickering light in our daily life, we decided to analyze the effect of colour flickers on variability of the accommodation response (VAR) in emmetropes and myopes.MethodsWe measured the dynamic accommodative responses of 19 emmetropic and 22 myopic adults using a Grand Seiko WAM-5500 open-field autorefractor. The subjects focused for more than 20 s on a black Snellen E target against three different backgrounds made up of three colour flicker combinations (red/green, red/blue and blue/green) and under five frequency conditions (0.20 Hz, 0.50 Hz, 1.00 Hz, 1.67 Hz, and 5.00 Hz).ResultsFlicker frequency and colour both had a significant effect on VAR. Lower frequencies were associated with larger variability. Colour had an effect only at low frequencies, and red/blue colour flicker resulted in the largest variability. The variability in myopes were larger than those in emmetropes.ConclusionsThese findings support the hypothesis that further studies on the colour and temporal frequency of flickering light can lead to a better understanding of the development and progression of myopia.
Highlights
Myopia is hypothesized to be influenced by environmental light conditions
We figure whether the variability of the accommodation response (VAR) under colour flickers will be different between myopes and emmetropes as accommodative microfluctuations (AMFs) are the base of accommodative fluctuation
The effect of colour and temporal frequency on VAR Our study showed that colour and temporal frequency both had significant effects on VAR
Summary
Myopia is hypothesized to be influenced by environmental light conditions. For example, it has been shown that colour and temporal frequency of flickering light affect emmetropisation in animals. Myopia is an important global health problem that, by the year 2050, is projected to affect 49.8% of the world’s population [1,2,3]. It has gained the attention of many researchers who investigate its underlying causes [4, 5]. Colour flickers may lead to a bigger accommodative fluctuation based on the inherent AMFs and enlarge the variability of the accommodation response (VAR). We figure whether the VAR under colour flickers will be different between myopes and emmetropes as AMFs are the base of accommodative fluctuation
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