Vasectomy reversal is done through microsurgical approach  and uses a high-powered microscope to magnify structures. Use of an operating microscope provides better results and allows the urologist to manipulate stitches smaller in diameter than an eyelash to join the ends of the vas deferens. When microsurgery is used, vasovasostomy results in return of sperm to the semen in 70-95 percent of patients and resulting pregnancy in 30-75 percent of female partners. These numbers however depend upon the length of time from the vasectomy until the reversal but more importantly the microscopic finding of sperm during the operation under a microscope.