Selig Percy Amoils, FRCS, born 1933, is a South African ophthalmologist and biomedical engineering inventor.

Born, raised, and educated in Johannesburg, South Africa, Amoils briefly studied mechanical engineering prior to attending medical school at the University of Witwatersrand where he earned his MB and BCh in 1956.

His specialist training was with Baragwanath Hospital in Soweto, Moorfields Eye Hospital in London, and Massachusetts Eye and Ear Infirmary as a Clinical Fellow and research scientist specializing in retinal diseases and surgery and glaucoma.

Selig Percy Amoils is known for his invention of the world's first surgical tool that uses extreme cold (nitrous oxide) to destroy unwanted tissue.   

His invention has transformed cryosurgery (the use of extreme cold produced by liquid nitrogen) for gynaecology, lung, heart, mouth, liver and prostate surgery.

Cryosurgery is the use of extreme cold in surgery to destroy abnormal or diseased tissue. Cryosurgery has been historically used to treat a number of diseases and disorders, especially a variety of benign and malignant skin conditions. 

He advanced cryosurgery for cataracts and retinal detachments during 1962 at Baragwanath hospital in Soweto. This led to the Joule-Thomson effect cryoprobe in 1965, using carbon dioxide or nitrous oxide to cool the probe, this dramatically changed cataract and retinal surgery. Amoils achieved wide recognition for his invention and in 1975 received a Queen's Award for Technological Innovation. His cryoprobe has since been on display in the Kensington Museum in London. 

His system is still widely used in the fields of ophthalmology and gynaecology. 

According to en.wikipedia