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Why don't human eyes recognize the color of water?

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The vertebrate eye is usually either optimised for underwater vision or air vision, as is the case in the human eye. The visual acuity of the air-optimised eye is severely adversely affected by the difference in refractive index between air and water when immersed in direct contact. read more

Apparent color is the color of the whole water sample, and consists of color from both dissolved and suspended components. True color is measured after filtering the water sample to remove all suspended material. read more

When they have infected the eye, they cause the iris to change the color, eye treatments such as herbal eye drops can also change your eye color. When you have undergone eye surgery, your eyes also changes the eye color. Eye surgery destroys the thin brown layer that surrounds the pupil of the eye. This process leaves the eye with a lighter color. read more

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