Evaluation on rigid gas permeable contact lens for keratoconus guided by OCULUS topography

Objective To evaluate the effectiveness and accuracy of rigid gas permeable contact lens(RGPCL)for keratoconus guided by OCULUS topography.Methods The 26 patients with keratoconus(40 eyes),who fitted with RGPCL in our hospital from June 2008 to December 2009 were enrolled.Gasses were chosen and prescription was determined according to curvature detected by corneal topography.Average myopic degree and astigamtism were(-7.12±6.12)D and(-3.28±1.57)D in patients with keratoconus.Best corrected visual acuity,corneal topography,ocular physiology and subjective symptoms were assessed.All patients were followed up for 6 to 29 months.Results The average radian of RGOCL was(7.40±0.45)mm,the aveage diameter was(9.12±0.24)mm,and the average diopter was(-7.10±3.30)D.For patients with best corrected visual acuity be and less than 4.5,there were 4 eyes with glasses,and 3 eyes with RGPCL.For patients with best corrected visual acuity from 4.6 to 4.9,there were 17 eyes with glasess,and 10 eyes with RGPCL.For patients with best corrected visual acuity be and more than 5.0,there were 4 eyes with glasses,27 eyes with RGPCL.Patients with RGPCL had better best corrected visual acuity than those with glasses(P0.05).At following up,steep topography curvature unchanged in 32 eyes,increased in 3 eyes,and decreased in 5 eyes.Glasess of 6 eyes lost and 2 eyes broke,glasess could be refitted.No serious complication was found.Conclusion The efficiency of RGPCL for keratoconus increases when guided by topography.RGPCL obviously improves corrected visual acuity,safety and stability for patients,and without obvious complication.