Dr Keet graduated from the University of Pretoria in 1987. He is a fellow of the College of Ophthalmologists of South Africa as well as the Royal College of Surgeons of Edinburgh. He underwent specialist training in Ophthalmology at Groote Schuur Hospital and The University of Cape Town from 1992 to 1996. He spent the following year in Dublin, Ireland where he completed a fellowship in Cataract and Refractive Surgery.
At the end of 1997, Dr Keet returned to South Africa and founded The Eye Centre. In 1998 he established the eye clinic for indigent patients at Helderberg Hospital, which remains in service.
Dr Keet has a keen interest in cataract and refractive surgery and treats all other general eye conditions such as glaucoma, diabetic eye disease, age-related macular degeneration and squints.
He is an active member of the Ophthalmological Society of South Africa (OSSA), the South African Glaucoma Society (SAGS), the Southern African Society of Cataract and Refractive Surgery (SASCRS) and the European Society of Cataract and Refractive Surgeons (ESCRS).