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

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

Type of refractive procedure	Preoperative myopic refraction (D), reported per year
Type of refractive procedure		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
LASIK	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
PRK	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
RLE	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
Phakic IOL AC	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	*
Epi-LASIK	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	*
LASEK	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
Type of refractive procedure		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	*	*

* = Too few cases for statistical analysis, data given only if N > 30.
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.
The table shows trend, over time, in the database.

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