[Correcture of keratoconus with contact lenses made from HEMA and gas permeable materials (author's transl)].

After discussing the oxygen demand of the cornea the relevance is shown on basis of 100 patients who wear normal HEMA-lenses in contrast to 100 patients with ultra-thin-lenses, and after doing so it is stated that as well cornea curvations as well as refractions are hardly changed by the wear of ultra-thin contact lenses. These ultra-thin soft lenses have proved extremely successful in case of visual defects ranging from - 16,0 to + 16,0 dioptrics. The use of ultra-thin soft lenses has not proved successful in case of heavy astigmatism and keratoconus. In these cases lenses made from Polycon and BPflex were used, which proved very compatible and have corrigated the visual defect in the best way possible. Also here a comparativing research of 100 patients with PMMA-lenses and 100 patients with Polycon and BPflex-lenses has proved a successful fit and possiblity of correcture of these beforesaid visual defects.