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Sexual activity can trigger a spike in heart rate, blood pressure, and other nervous system activity. Apparently, for some people, sex can also cause blindness. Fortunately only temporary.

As quoted from Discovermagazine, December 30, 2010, these findings revealed two PhD students from the Molecular and Cell Biology, University of California, Berkeley.

Both researchers found cases in which a patient experienced temporary loss of visual ability every time he experienced a climax during sexual intercourse. Strangely, this case does not occur even though the patient has other heavy physical activity.

"Before, we did not know why only sex that causes blindness," said one researcher. "But it was found that vasoconstriction was the cause," he said.

For information, vasoconstriction is the place where the walls of the muscles to contract around blood vessels and inhibits blood flow.

In its report, the two researchers write, early suspicion of loss of visual ability in patients while they are vasoconstriction or embolism (formation of blood vessel blockage by an embolus in the vessels that supply blood to the eye).

"Symptoms that arise are temporary but occurred repeatedly in our patients to prove the case was not associated with embolism," say researchers in a report.
In addition, both researchers said, the solution of the symptoms after treatment with vasodilator enalapril provide support the theory that vasoconstriction is a cause temporary blindness in these patients.

Interestingly, vasoconstriction is also the same conditions that cause erectile dysfunction in which the amount of blood into the penis to make the most of erection, not enough.