The Correction of Corneal Astigmatism Using Piggyback Contact Lens

ABSTRACT

We evaluated the effects of piggyback contact lens that override the hard contact lens over soft contact lens for irregular astigmatic correction. Two patients received corneal suture for corneal laceration and one patient received penetrating keratoplasty for Francois dystrophy. The uncorrected visual acuity was counting fingers at 20cm, 0.05, and 0.08, respectively and corrected visual acuity using glasses or conventional contact lens was 0.1, 0.2, and 0. 2, respectively. The difference of keratometry reading between two meridians is 6, 7.5, and 12.5 diopters, respectively. The visual acuity after piggyback contact lens fitting was 0.4, 0.9, and 0.3, respectively. The complication such as corneal ederna, corneal erosion, and neovascularization of cornea was not noted during 24 months after piggyback contact lens fitting. The piggyback contact lens fitting inay be an effective method of correcting visual acuity for irregular astigmatism.