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Healthy men who took Viagra or Cialis daily for six months did not significantly developed vision problems, U.S. researchers said Monday in a study funded by the company in response to popular concerns about treatment failure. Pfizer Inc. (PFE.N) Viagra or sildenafil, and Eli Lilly and Co (en LLY.N) or Cialis impotence treatment by increasing blood flow to the genitals, but some men use drugs reported blurred vision, bluish vision or change the perception of light.

drugs work by blocking the action of the enzyme type 5 PDE5 phodiesterase or blood vessels in the penis. However, PDE5 inhibitors may also affect blood vessels in the retina, which may explain some of the reports of eye problems. To test this, a team led by Dr. William Cordell of Lilly Research Laboratories in Indianapolis, and colleagues conducted a randomized study to find changes in the retina in men taking Viagra or Cialis. They studied 244 healthy men or those with mild erectile dysfunction in the age of 30 to 65 who had no vision problems. Of these, 85 have Cialis 5 mg, 77 mg of sildenafil it took 50 and 82 took a placebo daily for six months. men have been critical of a global perspective, including electroretinography, a test to measure the electrical response of the cells sensitive to light in the eyes, before, during and after treatment.

Of the 194 men who completed the study, researchers found no significant difference between treatment and placebo in the Erg, tests of visual function, measuring the pressure in the globe eye or evaluation anatomy of the eye. “Our results show that there were no injuries or cumulative effect of the clinic,” for studies of dose or drug, the researchers wrote in the Archives of Ophthalmology. They said their study was limited because the doses used were lower than those of other studies found that changes in the retina.