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Color blindness or color vision deficiency ( CVD) is the decreased ability to see color or differences in color. [ 2] The severity of color blindness ranges from mostly unnoticeable to full absence of color perception. Color blindness is usually an inherited problem or variation in the functionality of one or more of the three classes of cone ...
For others, colors are triggered when musical notes or keys are being played. People with synesthesia related to music may also have perfect pitch because their ability to see and hear colors aids them in identifying notes or keys. [21] The colors triggered by certain sounds, and any other synesthetic visual experiences, are referred to as ...
Heterochromia iridum. Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [ 1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment ). It may be inherited, or caused by genetic mosaicism ...
Monochromacy (from Greek mono, meaning "one" and chromo, meaning "color") is the ability of organisms to perceive only light intensity without respect to spectral composition. Organisms with monochromacy lack color vision and can only see in shades of grey ranging from black to white. Organisms with monochromacy are called monochromats.
Your kids and their teachers will thank you. Make eye exams part of the back-to-school checklist. Your kids and their teachers will thank you. When a little boy burst into tears in her third-grade ...
Vitamin A deficiency is estimated to affect approximately one third of children under the age of five around the world, [73] possibly leading to the deaths of 670,000 children under five annually. [74] Between 250,000 and 500,000 children in developing countries become blind each year owing to vitamin A deficiency. [3]
Blue light, a type of high-energy light, is part of the visible light spectrum. High-energy visible light (HEV light) is short-wave light in the violet/blue band from 400 to 450 nm in the visible spectrum, which has a number of purported negative biological effects, namely on circadian rhythm and retinal health (blue-light hazard), which can lead to age-related macular degeneration.
Red reflex. The red reflex (also called the fundal reflex) refers to the reddish-orange reflection of light from the back of the eye, or fundus, observed when using an ophthalmoscope or retinoscope. It is important to note that the red reflex may be absent or poorly visible in people with dark eyes, and may even appear yellow in Asians or green ...