Our eyesight declines with age and poor lighting or strong contrasts between light and dark can limit the ability of older people to react in everyday life, resulting in a negative impact on the sleep ...

THE Departmental Committee on Sight Tests has recommended a method of classifying colour-blindness by measuring the luminosity of the colour sensations by means of the flicker method of photometry.

WASHINGTON -- Although LEDs are increasingly used in low-energy lighting and displays, consumers sometimes find their light harsh or unpleasant. Findings from a new study point to the need to take age ...

Although LEDs are increasingly used in low-energy lighting and displays, consumers sometimes find their light harsh or unpleasant. Findings from a new study point to the need to take age-related ...