Red Light Eye Care: 3 Minutes Therapy Every Morning! Researchers found there was, on average, a 17% improvement in participants" colour contrast vision when exposed to three minutes of 670 nanometre (long wavelength) deep red light in the morning and the effects of this single exposure lasted for at least a week. -- UCL News† This app fills full screen color of deep red light about 670nm wavelength†† for three minutes. † - We have no relation to UCL †† - Logical value. DISCLAMER AND CAUTION - Using this app at your own decision and risk. - This app doesn't guarantee any health improvement. - Even staring display might have possibility to harm your eyes. - Never using this app more than three minutes in a day. - Always consulting your doctor.