Like most healthcare professions, the education and certification of optometrists is regulated in most countries. Optometric professionals and optometry-related organizations interact with governmental agencies, other healthcare professionals, and the community to deliver eye- and vision-care.
The average length of an erect penis is 5.16 inches (13.12 centimeters) and the average circumference is 4.59 inches (11.66 centimeters), according to a new analysis of penis length studies involving more than 15,000 men around the world.
1. The average erect penis is a little more than 5 inches long and 1.5 inches in diameter. Specifically, a 2013 study published in the Journal of Sexual Medicine found the average American manâs penis is 5.6 inches (14.2 centimeters) long when erect and 4.8 inches in circumference.Only 15 percent of men are over 7 inches, and only three percent are over 8 inches.pecifically, a 2013 study published in the Journal of Sexual Medicine found the average American manâs penis is 5.6 inches (14.2 centimeters) long when erect and 4.8 inches in circumference.