Abstract
Abstract: :
Purpose: To assess the long–term stability, efficacy and safety of hyperopic LASIK Methods: 26 patients (40 eyes) with hyperopia underwent LASIK, using a Moria LSK one microkeratome and a Summit SVS Apex Plus laser with an optical zone of 6.5mm and a blend zone of 1.5mm. Only simple hyperopia was treated with no astigmatic correction. All eyes had a follow–up of 5 years. Results: Mean age at time of surgery was 51 years (32–64). Mean pre–operative spherical equivalent (SE) was +3.82D (+0.75 to +7D). Mean attempted correction was +3.38D (+1 to +6D). At 12 months mean SE was +0.31D (–1.375 to +1.75D), with a mean correction of –3.5D and 70% of eyes within +/–1D. At 5 years mean SE was +0.84D (–0.375 to +3.375D), with a mean correction of –3D and 62.5% of eyes within +/–1D. There was a significant reduction of hyperopic correction between 12 months and 5 years (p<0.001), with 72.5% of eyes showing some reduction of correction. This was more marked with corrections >+4D (n=15) where there was an average increase in hyperopia of +0.95D. For corrections up to +3D, 76% of eyes were within +/–1D at 5 years compared to 40% for corrections between +4 to +6D. At 5 years UCVA was improved in 38 eyes (95%) and was >20/25 in 28 eyes (70%). BSCVA was improved/unchanged in 34 eyes (85%) and reduced by 1 line in 6 eyes (15%). No eyes lost <1 line. One eye had persistent micro–striae. No eyes developed ectasia. Conclusions: LASIK appears to be a safe and moderately effective procedure for low degrees of hyperopia. However, there appears to be significant regression of achieved correction over 5 years (more than would be expected with age–related hyperopic increases), especially for corrections >+4D. The long–term stability of hyperopic LASIK corrections are therefore uncertain.
Keywords: hyperopia • laser • refractive surgery