[Modification of the 2 loop-Medallion-lens (author's transl)]

The loop diameter was enlarged from 7.6 to 8.5 mm and the holes for the iris fixation suture were placed upwards towards the margin of the haptic. This resulted in a marked decrease of loop-dislocations when comparing two groups with 80 (old lens) and 120 eyes (new lens) respectively. Spontaneous loop-dislocations occurred in 5% with the original lens and in 0.8% with the altered lens, iatrogenic dislocations, i.e. following the instillation of a weak mydriatic, occurred in 10% with the older typ but only in 0.8% with the new lens.