. Blue light absorption with dyes: yellow filters Another way to prevent harmful blue-violet light from entering the eye is to reduce the unwanted wavelengths by absorbing them with yellow dye, a chemical compound
whose structure allows absorption in the visible part of the light spectrum of its complementary color: in this case, blue. This is why most blue-absorbing lenses appear more or less yellow depending on the level of their blue-filtering properties. A highly-efficient blue-blocking lens would appear deep yellow, while a moderately efficient blue-blocking lens would appear merely yellowish.
The advantage of the yellow dye solution is that it can reduce a significant amount of blue light, but the intense yellow color is detrimental to its cosmetic appearance and detracts from human color perception. A highly intense yellow filter, for example, will induce color distortion despite the ability of the brain to adapt chromatically.
There is a way to circumvent the yellow color of an absorbing filter that involves “color balancing” the tint by adding a small proportion of another dye. The complementary dye absorbs in another region of the visible spectrum, creating a global neutral grey filter (Fig. 7). This solution is acceptable for low yellow colors – where color balancing can be efficient – but not possible for dark yellow tones. It should be noted as well that color balancing in general is detrimental to the global photopic transmission of a lens since it causes a loss of visible transmission (or clarity).
. Blue light absorption with dyes: yellow filters Another way to prevent harmful blue-violet light from entering the eye is to reduce the unwanted wavelengths by absorbing them with yellow dye, a chemical compound whose structure allows absorption in the visible part of the light spectrum of its complementary color: in this case, blue. This is why most blue-absorbing lenses appear more or less yellow depending on the level of their blue-filtering properties. A highly-efficient blue-blocking lens would appear deep yellow, while a moderately efficient blue-blocking lens would appear merely yellowish.The advantage of the yellow dye solution is that it can reduce a significant amount of blue light, but the intense yellow color is detrimental to its cosmetic appearance and detracts from human color perception. A highly intense yellow filter, for example, will induce color distortion despite the ability of the brain to adapt chromatically.There is a way to circumvent the yellow color of an absorbing filter that involves “color balancing” the tint by adding a small proportion of another dye. The complementary dye absorbs in another region of the visible spectrum, creating a global neutral grey filter (Fig. 7). This solution is acceptable for low yellow colors – where color balancing can be efficient – but not possible for dark yellow tones. It should be noted as well that color balancing in general is detrimental to the global photopic transmission of a lens since it causes a loss of visible transmission (or clarity).
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