The physiologic mechanism of erection from the penis involves launch of nitric oxide (NO) from the corpus cavernosum through sexual stimulation. Sildenafil can decrease blood flow towards the optic nerve of the eye, leading to unexpected eyesight decline. This has transpired in a small range of people today taking sildenafil, https://rylanf9516.frewwebs.com/34707596/top-latest-five-viagra-urban-news