Search results
Results From The WOW.Com Content Network
Surveys show that 40 to 70 percent of those 65 years old and older suffer from chronic sleep disturbances. [2] The elderly tend to go to bed early in the evening and wake earlier in the morning than younger adults. Furthermore, the elderly often wake several times throughout the night and have difficulty falling asleep.
A 1997 study of White Americans found that eye color may be subject to change in infancy, and from adolescence to adulthood. [24] 17% of children experienced a change of eye color by adulthood. Of those children, 50% of developed lighter eyes as they got older.
More melanin means darker eyes, hair or skin. The color of the melanin in the eyes is determined by three other genes, EYCL1, 2 and 3. Together, they account for brown, green and blue, but not ...
There is some confusion over how the focusing mechanism of the eye works. [clarification needed] In the 1977 book, Eye and Brain, [13] for example, the lens is said to be suspended by a membrane, the 'zonula', which holds it under tension. The tension is released, by contraction of the ciliary muscle, to allow the lens to become more round, for ...
People with lighter eyes also consume significantly more alcohol, as darker eyed people require less alcohol to become intoxicated. The reason boils down to genes.
For premium support please call: 800-290-4726 more ways to reach us
The eye takes approximately 20–30 minutes to fully adapt from bright sunlight to complete darkness and becomes 10,000 to 1,000,000 times more sensitive than at full daylight. In this process, the eye's perception of color changes as well (this is called the Purkinje effect). However, it takes approximately five minutes for the eye to adapt ...
Picture of the back of the eye showing intermediate age-related macular degeneration: Specialty: Ophthalmology, optometry: Symptoms: Blurred or no vision in the center of the visual field [1] Complications: Visual hallucinations [1] Usual onset: Older people [1] Types: Early, intermediate, late [1] Causes: Damage to the macula of the retina [1 ...