birth_place profession birth_date image article_title education birth_name
johannesburg , south africa ophthalmologist 1933 selig percy amoils00.jpg selig percy amoils
 university of witwatersrand selig percy amoils
selig percy amoils

selig percy amoils , frcs , born 1933 , is a south african ophthalmologist and biomedical engineering inventor .
in 1965 , amoils refined the cryoextraction method of cataract surgery by developing a cryoprobe that was cooled through the joule-thomson effect of gas expansion .
his system is still widely used in the fields of ophthalmology and gynaecology .
amoils was also awarded a patent for his `` rotary epithelial scrubber '' , an improvement on the brush first developed by ioannis pallikaris that removes corneal epithelial cells in preparation for photorefractive keratectomy .
another development of his in 1970 , was the diamond vitrectomy cutter , various instruments enabling micro-control of blade depth in radial keratotomy , as well as the oval comparator , or astigmometer , to control astigmatism after cataract surgery .
