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.
The average American man's penis is 5.6 inches (14.2 centimeters) long when erect, a new survey of 1,661 men finds.The study, published online July 10 in the Journal of Sexual Medicine, is relatively consistent with the results of prior surveys of penis size.he smallest erect penis in the study was about 1.6 inches (4 cm) long, and the largest was 10.2 inches (26 cm) long. The average penile girth was about 4.8 inches (12.2 cm). Moreover, all erections are not created equal, the study also found.