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2. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Many times the glasses do not appear to have much of a tint, or, if any, a slight yellow tint, but they may be more heavily tinted. Long hours of computer use (not blue light) may cause eye strain. [ 13 ] [ 16 ] [ 14 ] [ 17 ] Many eye symptoms caused by computer use will lessen after the usage of the computer is stopped. [ 13 ]

3. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

4. Ruff (clothing) - Wikipedia

   en.wikipedia.org/wiki/Ruff_(clothing)

   The bluish tint of a ruff was supposed to make the wearer's complexion appear paler, thus more attractive to contemporaries. [9] Elizabeth I took against this colour and issued a royal prerogative : "Her Majesty's pleasure is that no blue starch shall be used or worn by any of her Majesty's subjects, since blue was the colour of the flag of ...

5. Color blindness - Wikipedia

   en.wikipedia.org/wiki/Color_blindness

   Rarer genetic conditions causing color blindness include congenital blue–yellow color blindness (tritan type), blue cone monochromacy, and achromatopsia. Color blindness can also result from physical or chemical damage to the eye, the optic nerve, parts of the brain, or from medication toxicity. [2] Color vision also naturally degrades in old ...

6. List of refractive indices - Wikipedia

   en.wikipedia.org/wiki/List_of_refractive_indices

   Refraction at interface. Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion.

7. List of common misconceptions about science, technology, and ...

   en.wikipedia.org/wiki/List_of_common...

   Human blood in veins is not actually blue. Blood is red due to the presence of hemoglobin; deoxygenated blood (in veins) has a deep red color, and oxygenated blood (in arteries) has a light cherry-red color. Veins below the skin can appear blue or green due to subsurface scattering of light through the skin, and aspects of human color ...