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Albinism is a congenital condition characterized in humans by the partial or complete absence of pigment in the skin, hair and eyes. Albinism is associated with a number of vision defects, such as photophobia, nystagmus, and amblyopia. Lack of skin pigmentation makes for more susceptibility to sunburn and skin cancers.
Healthy narcissism is a positive sense of self that is in alignment with the greater good. [1][2][3] The concept of healthy narcissism was first coined by Paul Federn and gained prominence in the 1970s through the research of Heinz Kohut and Otto Kernberg. [1][4] It developed slowly out of the psychoanalytic tradition, and became popular in the ...
Exposure of skin to ultraviolet radiation from sunlight presents both positive and negative health effects. On the positive side, UV exposure enables the synthesis of vitamin D3, which is essential for bone health [1] and potentially plays a role in inhibiting certain cancers. [2][3] While vitamin D can also be obtained through dietary ...
The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and keeping balance. Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer ...
If you’ve ever (perhaps jealously) observed happy couples and thought they had a perfect healthy relationship, you may have been surprised the first time you saw them disagree or learned, in ...
Health has a variety of definitions, which have been used for different purposes over time. In general, it refers to physical and emotional well-being, especially that associated with normal functioning of the human body, absent of disease, pain (including mental pain), or injury. Health can be promoted by encouraging healthful activities, such ...
Body fat and BMI are both important indicators of health, but they’re not equal. Here’s a recap: BMI compares your weight to your height. It’s an easy calculation you can do at home to get ...
The optic nerve is a bundle of millions of fibers in the retina that sends visual signals to the brain. Damage and death of these nerve cells, or neurons, leads to characteristic features of optic neuropathy. The main symptom is loss of vision, with colors appearing subtly washed out in the affected eye.
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