A coloured male, aged i6 years, whose occupation was a metal grinder, was first seen in the Eye Out-Patients' Department at Groote Schuur Hospital on July I6, I97I. He gave a 3-day history of a sudden onset of pain in the left eye followed by swelling of the lids and proptosis. He could not recall sustaining trauma to the left eye nor could he recall being injured by a foreign body entering the...