either of two pairs of mucomembranous folds in the larynx. The upper pair (false vocal cords) are not concerned with vocal production; the lower pair (true vocal cords or vocal folds) can be made to vibrate and produce sound when air from the lungs is forced over them See also glottis related adjective glottal.
Vitamin A drops. Vitamin A eye drops have been found to help provide lubrication for dry eyes and eye drops that contain vitamin A, such as Dakrina, VivaDrops and other over the counter drops with vitamin A added are often preferred to prescription solutions for dry eyes.itamin A eye drops have also been shown to provide treatment for a specific type of eye inflammation called, superior limbic keratoconjunctivitis that affects the cornea and inside of the upper eyelids.
In ancient Egypt, it was discovered that night blindness could be cured by eating liver, which later was found to be a rich source of vitamin A. A lack of vitamin A causes the cornea to become very dry, leading to clouding of the front of the eye, corneal ulcers and vision loss.Vitamin A deficiency also causes damage to the retina, which also contributes to blindness. Good food sources of retinol vitamin A include beef and chicken liver, whole milk and cheese. 2  Vitamin A obtained from colorful fruits and vegetables is in the form of provitamin A carotenoids, which are converted to retinol by the body after the food is ingested.