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.
While results vary across studies, the consensus is that the average erect human penis is approximately 12.9â15 cm (5.1â5.9 in) in length with 95% of adult males falling within the interval 10.7â19.1 cm (4.2â7.5 in). Neither age nor size of the flaccid penis accurately predicts erectile length.