Arnall Patz (June 14, 1920 – March 11, 2010) was an American medical doctor and research professor at Johns Hopkins University.

He received the Lasker Award in 1956 for his research into the causes and prevention of blindness and the Presidential Medal of Freedom in 2004 for his lifetime of work in the field of ophthalmology.

[3] Further study established that elevated oxygen levels caused abnormal growth of blood vessels in the eye, irreversibly damaging the retina.

[1] After Patz's findings became known, the use of high-dose oxygen therapy was limited, and there was a sixty percent reduction in childhood blindness in the United States.

[1] In 1955, Patz accepted a part-time faculty position at Johns Hopkins University while maintaining a private ophthalmology practice.

[1][3] Patz also worked with the Maryland Eye Bank, built an 80-foot radio tower at his home and "became known to ham-radio operators across the country for putting out word on the airwaves whenever corneas were needed for transplant.

[3][8] Patz was given the Presidential Medal of Freedom "for his lifetime contributions to the field of ophthalmology, including his discovery of the most common cause of childhood blindness in the early 1950s.

[3] In 2013, a biographical profile of Dr. Patz was included in a bestselling book called Saving Sight: An eye surgeon's look at life behind the mask and the heroes who changed the way we see, by Andrew Lam, M.D.