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Table 3 Mean and maximum preoperative refraction, of myopic and hyperopic patients, who underwent various refractive procedures

From: The European registry of quality outcomes for cataract and refractive surgery (EUREQUO): a database study of trends in volumes, surgical techniques and outcomes of refractive surgery

Type of refractive procedure Preoperative myopic refraction (D), reported per year
  2006 2007 2008 2009 2010 2011 2012 2013 2014
LASIK Mean −3.9 −3.2 −3.5 −3.3 −3.5 −3.7 −3.5 −3.4 −3.2
Maximum −11.25 −12.0 −10.0 −11.0 −10.0 −10.25 −11.75 −10.25 −8.25
PRK Mean −3.9 −2.3 −3.7 −3.1 −2.9 −3.1 −3.5 −3.2 −3.3
Maximum −9.5 −5.5 −4.25 −8.0 −9.0 −9.5 −9.25 −8.5 −8.5
RLE Mean −6.7 * * −6.2 −5.9 −5.9 −4.7 −6.0 −7.1
Maximum −14.0 * * −6.5 −10.0 −11.75 −19.0 −20.0 −15.5
Phakic IOL AC Mean * * −7.4 −8.6 −10.3 −8.4 −8.5 −9.0 −8.3
Maximum * * −10.25 −15.25 −16.5 −20.0 −20.0 −20.0 −15.75
Epi-LASIK Mean −4.4 * * −3.5 −3.3 −2.8 −3.5 −3.25 *
Maximum −8.25 * * −6.25 −6.25 −8.0 −8.25 −9.5 *
LASEK Mean −3.2 −2.5 −4.4 −4.0 −3.4 −3.5 −3.7 −3.5 *
Maximum −10.5 −7.25 −10.5 −9.0 −10.0 −11.5 −11.25 −11.75 *
Type of refractive procedure Preoperative hyperopic refraction (D), reported per year
  2006 2007 2008 2009 2010 2011 2012 2013 2014
LASIK Mean 2.7 2.1 2.5 2.4 2.5 2.4 2.2 2.3 2.5
  Maximum 15.0 5.8 5.8 6.5 6.3 7.3 6.0 6.5 5.5
PRK Mean * * * * 1.4 1.4 1.5 1.2 *
  Maximum * * * * 4.3 3.2 4.5 7.3 *
RLE Mean 4.4 * * * 3.1 3.4 3.0 3.2 4.5
  Maximum 9.5 * * * 9.5 9.8 10.8 10.0 10.3
Phakic IOL AC Mean * * * * * 5.2 4.9 5.2 *
  Maximum * * * * * 10.3 8.3 10.5 *
LASEK Mean 2.1 * * * 1.8 1.6 2.0 * *
  Maximum 6.0 * * * 4.5 6.0 6.5 * *
  1. * = Too few cases for statistical analysis, data given only if N > 30.
  2. LASIK = Laser-assisted in-situ keratomileusis, PRK = Photorefractive Keratectomy, RLE = Refractive Lens Exchange, Phakic IOL AC = Phakic intra-ocular lens in anterior chamber, Epi-LASIK = Epithelial LASIK, LASEK = Laser-Assisted Subepithelial Keratectomy.
  3. The table shows trend, over time, in the database.