“…At least 12 English-language papers have described the light or electron microscopy of this condition. They included material from regions where external climatic factors appeared to be the main aetiological agent (Klintworth, 1972;D'Alena and Wood, 1972;Garner et al, 1973;Johnson and Ghosh, 1975), cases from temperate regions where no definite aetiology was proposed (Etzine and Kaufmann, 1964;Christensen, 1973;Garner et al, 1976), and cases of spheroidal degeneration in association with a corneal dystrophy (Garner, 1970), and in association with other intraocular disease and trauma Brownstein et al, 1973;Rodrigues et al, 1975;Cursino and Fine, 1976).…”