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.
There are no average length figures for teenagers because people grow at different rates. According to a 2015 study of more than 15,000 men, the average dimensions for an adult penis are: 1  length: 13.12cm (5.16 inches) when erect.  circumference: 11.66cm (4.59 inches) when erect.