AIM: To assess the efficacy, safety, stability and predictability of an implantable Phakic contact lens in patients with stable keratoconus.

METHODS: The uncorrected and the best corrected visual acuity, defocus curve, contrast sensitivity, refraction and possible side effects were measured in 14 patients after utilizing implantable Phakic contact lens(IPCL)to correct refractive errors. The result was assessed for more than 6mo.

RESULTS: The mean preoperative spherical equivalent(SE)and astigmatism got 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 6mo. Before the preoperative the mean Snellen visual acuity was 0.18±0.10 LogMAR. The mean uncorrected and the best corrected visual acuity got changed to 0.13±0.10 LogMAR and 0.05±0.15 LogMAR, respectively in 6mo. The mean safety indices were 1.11. There was no loss of visual acuity in any of the eyes and 22 eyes(78.5%)gained one or more lines. Twenty eyes(71.4%)were within 0.50 D and 27(96.42%)were within ±1.00 D of the desired spherical equivalent refraction. There was a change in manifest refraction of -0.23±0.43(range from -1.00 to +0.75)from the first week of surgery to 6mo. Contrast sensitivity got improvement value at 3 per degree(P<0.005)after Toric IPCL implantation. The total 6mo corneal endothelial cell loss(ECL)was less than 5%. Intraocular pressure(IOP)was 11.32±2.28 mmHg after 6mo.

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.