Visual Outcomes of a New Implantable Phakic Contact Lens in Patients with Stable Keratoconus: Six Months Follow Up

Purpose: The purpose was to assess the efficacy, safety, stability, and predictability of implantable Phakic Contact Lens (toric IPCL, Care Group India) in patients with stable keratoconus. Methods: The uncorrected and best corrected visual acuity, defocus curve, contrast sensitivity, refraction and possible side effects were measured in 14 patients after utilizing an implantable Phakic Contact Lens (IPCL) to correct refractive error. The result was assessed more than six month. Results: The mean pre-surgical spherical equivalent (SE) and astigmatism changed from -6.94±2.79 DS and - 4.24±1.42 DC to -0.23±0.43 DS and -1.05±0.49 DC, respectively at the last examination after six months. Beforethe pre-operation the mean Snellen visual acuity was 0.18±0.10 logMar. The mean uncorrected and best corrected visual acuity changed to 0.13±0.10 logMar and 0.05±0.15 logMar, respectively at six months. The mean safety indices were 1.11. There was no loss of visual acuity in any of the eyes and 22eyes (78.5 per cent) gained one or more lines. Twenty eyes (71.4 per cent) were within 0.50 D and 28 (100 per cent) were within ±1.00 D of the desired spherical equivalent refraction. There was a change in manifest refraction of -0.23±0.43 (range:-1.00 to +0.75) from the first week of surgery to six months. Contrast sensitivity improvement value at 3 per degree (p<0.005) after Toric IPCL implantation. The total 6 months corneal endothelial cell loss (ECL) was > 5%. No patient discontent was reported. Intraocular pressure (IOP) was 11.32±2.28 mm Hg after six months. Conclusion: The clinical consequences of the present study exhibit the efficacy, safety, and predictability of toric implantable Phakic Contact Lens in the correction of myopia and myopic astigmatism related with stable keratoconus. The patients refractions accomplished early dependability and stayed stable over the span of the study.