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Cyanopsia is a medical term for seeing everything tinted with blue. It can be caused by cataract removal, certain drugs, or psychological factors. Learn more about the causes, symptoms, and examples of cyanopsia.
The blue light spectrum, with wavelengths between 400 and 500 nm, has a broad impact on human health, influencing numerous physiological processes. Learn how blue light from natural and artificial sources affects the eye, the circadian rhythm, and the well-being, and how to reduce the hazards of blue light exposure.
The same DNA sequence of the OCA2 gene among blue-eyed people suggests they may have a single common ancestor. The researchers hypothesized that the OCA2 mutation responsible for blue eyes arose in an individual who lived in the northwestern part of the Black Sea region in Europe sometime between 6,000 and 10,000 years ago during the Neolithic ...
Learn how blue light, a type of short-wave light in the violet / blue band, can affect circadian rhythm, retinal health, and sleep quality. Find out the sources, evidence, and controversies of blue light exposure and filtering.
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame. They can be used for vision correction, eye protection, cosmetic purposes, or viewing specific visual information.
Contact lenses are typically inserted into the eye by placing them on the pad of the index or middle finger with the concave side upward and then using that finger to place the lens on the eye. Rigid lenses should be placed directly on the cornea. Soft lenses may be placed on the sclera (white of the eye) and then slid into place. Another ...