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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