Back when I was a child, whenever my eyes get all red and irritated my mother would always use Visine to "get the red out", as Pfizer put it. Visine is administered similarly to other brands of eye drops. One to two drops are applied to
irritated eye for three to four times a day. The active ingredient of this eye drop is Tetrahydrozoline ophthalmic. So how does it get the red out?
The reason why our eyes get red is because of the blood vessels. Tetrahydrozoline ophthalmic constricts these blood vessels which takes away the redness. Aside from eliminating the red coloration of the eyes, it is also used to relieve the eyes of dryness that may result from
excessive sun exposure and other irritants.
There are a few adverse effects that Tetrahydrozoline ophthalmic has on the eye, so you should be careful when using it. Since it constrict the
blood vessels, continuous use of the eye drop for more than 2 days may damage the veins and arteries of your eyes. Sometimes people think using Tetrahydrozoline ophthalmic in their eyes would help cure its complications but since it reduces the bloody supply to the organ the healing process is most likely to be prolonged.
