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At a fundamental level, no, we're fine with LED lighting. The absorption spectra of our cones are quite broad, and RGB LEDs are chosen to match our color sensitivity reasonably well. That red+green looks the same to us as light that is actually yellow is because our eyes can't tell the difference since we don't have good enough spectral resolution in our ...

In case of normal, healthy person, no, I don't think so. In fact, retinal detachment could happen at anytime of the day. Main causes are diseases and illness, such as AIDS, diabetic retinopathy, cancer, or trauma such as post-cataract surgery and being hit/kicked hard on the eyes.

The range of color perception in humans is primarily limited by the sensitivity of cone cells (specifically, the opsin proteins in cone cells) to various frequencies of light. This sensitivity drops off at 700 nm on one side and 380 nm on the other, which is where infrared and ultraviolet begin, respectively. Even with hypothetical infrared or ...