Hyposmia, a reduced ability to smell, affects half of those over age 65 and 75% of those over age 80. With aging the sense of smell deteriorates. Smoking seriously impairs the sense of smell in the short term and may cause long-term damage to olfactory receptors. Women often have a keener sense of smell than men do, especially at the time of ovulation.Prolonged vitamin A deficiency and the resulting below-normal amount of rhodopsin may cause night blindness or nyctalopia, an inability to see well at low light levels. As a result, the person cannot distinguish between red and green. The most common type is red-green color blindness, in which red cones or green cones are missing. ![]()
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