Pure anteropositioning of inferior oblique. A selective weakening procedure.

Anteropositioning of inferior oblique is of late becoming popular but it inadvertently also entails a compulsory recession which may be undesirable at times. We have evaluated the effect of a 'pure' anteropositioning procedure (11 eyes), with Elliot & Nankin's anteropositioning (10 eyes) and Parks' recession (17 eyes). The mean change of vertical deviation in elevation in adduction (surso adduction) was 15.09 +/- 8.3 prism dioptres (p.d.) in pure anteropositioning; 23.50 +/- 5.6 p.d. in E & N's anteropositioning and 14.82 +/- 5.9 p.d. in Parks' recession, showing this procedure to be as effective as a conventional recession procedure. However, while the latter two methods produced an intorsion, 'pure' anteropositioning produced no significant change in torsion. It is a much simpler procedure to weaken the elevation without affecting the torsion.