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 As much as 45% of men believe they have a small penis. 2  Across studies, flaccid length average from 7 to 10 centimeters (2.8 to 3.9 inches). 3  Flaccid circumference/girth average from 9 to 10 centimeters (3.5 to 3.9 inches).  Erect lengths average from 12 to 16 centimeters (4.7 to 6.3 inches).