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No, taking Viagra to enhance your bedroom performance won’t make it harder for you to see your partner. However, once in a while it could make everything seem a little blue, especially if you take the maximum 100 mg dose.
The chemicals in the drug can temporarily change how light hits your eye, and everything takes on a short-lived blue tint.
“This side effect can happen with higher doses, but it’s uncommon,” Dr. Montague says. “There’s no bad impact on the eye, but pilots can’t take it because of the possible color tint.”
For men taking Viagra, an unnerving side effect — light sensitivity, bluish-colored vision — has been a concern. But there’s no evidence that Viagra causes eye damage, even in those who take high doses, according to a new study.
Since Viagra lowers blood pressure overall, there was a suspicion that the drug might decrease blood flow to optic nerves — nerves that control vision — which can cause nerve damage.
However, this study of 13 men at Stanford University found that high doses of Viagra by and large preserved the thickness of the choroid layer of the eye, indicating that blood flow was normal. There were some small variations in thickness, which indicated that some men with an underlying blood vessel condition — such as hardening of the arteries — may indeed have changes in vision.
The study appears in the November-December 2002 issue of Ophthalmologica.
Some of the men did have more difficulties discriminating between shades of blue and green. However, those men had trouble seeing the difference between many colors.
“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,” says lead researcher Tim McCulley, MD, assistant professor of ophthalmology at Stanford University, in a news release.
