I am a competitive rifle shooter. Are there any colored filters to place in my rifle sight that would help to reduce eye fatigue or even simply aid in aligning things?
The best answer will probably vary a bit from person to person and with the particular details of the lighting. However, a good general rule for both the outdoor and indoor situations would be to use a yellow filter (or something similar). The yellow filters will remove short-wavelength (blue) light that is most detrimental to your visual acuity for many reasons. The blue light is scattered the most in the environment and in your visual system and thus produces the most flare that reduces the contrast of objects. Also, your visual system has very poor acuity for blue light (try reading blue text on a black background or yellow text on a white background, which is detected by the difference in the blue light, to see how poor your blue vision is) because of chromatic aberration in your eye and because of the distribution of different photoreceptor types. So looking through a yellow filter will give you the best contrast and acuity in general. You might be able to fine tune this a little
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