Viagra, But No Eye Effects.

Since Viagra was first introduced to public in 1999, a number of side effects in this medication was observed. Those include possible eye nerves damage. However some of these risks were ruled out by a UC Irvine College of Medicine study - even if the medicine is taken in large doses.

As Dr. Tim McCulley, assistant professor of ophthalmology, says, even high doses of Viagra don't decrease the blood flows in the eye. The fact that the erectile dysfunction drug reduces blood pressure aroused strong suspicion that Viagra causes lowered optical blood flow, which is able to bring about nerve damage.

McCulley introduced his study in the January 2003 issue of Ophthalmologica. "Viagra can change blood vessel structure as well as general blood pressure, so we needed to answer the question whether the drug could change blood vessels in the eye," McCulley said. "Our study may have had a small group of participants, but it showed very little change in blood vessels or blood flow in nearly all the patients."

After the test performed with 13 men at Stanford University by McCulley's team it was found out that the drug didn't affect the thickness of the eye's choroids layer, which provides the eyeball with blood. Nevertheless, the researchers found that men with underlying vascular illnesses are liable to changes in vision.

The team also didn't find interconnection between blood flow choroid thickness and changes in color vision , what is considered to be a common side effect of taking sildenafil citrate.

But in spite of everything McCulley's team verified these side effects, finding that Viagra users had a harder time discriminating among subtle changes in color. But they also found that no Viagra users reported problems in picking out any number of colors, excluding rare insignificant problems with distinguishing blue-green variety, as reported during the drug's clinical trials.

Viagra, But No Eye Effects.

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