Visible
Light
Light waves range in wavelength and frequency, but always travel at
the same speed (“the speed of light”). Visible light consists of light waves
falling within the wavelength range of 380 to 780 Nm (nanometers). Within
that visible range, the intensity of light can affect a person’s visual
perception. As the eye reacts to intense light, there is an immediate
degradation of vision – visual acuity, depth perception and color perception
decrease dramatically. For this reason, sunglasses that filter out some
light can improve an individual’s sight in strong light conditions. This is
especially noticeable on bright sunny days, out on the water, or on a snowy
or icy mountain.
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