Clinical Study
Eye (2008) 22, 1117–1123; doi:10.1038/sj.eye.6702856; published online 18 May 2007
Variables affecting refractive outcome following LASIK for myopia
Proprietary/competing interests: none
M H Feltham1,2, R Wong2, R Wolfe3 and F Stapleton2
- 1Mark Feltham Optometrists, London Circuit, Canberra, Australian Capital Territory, Australia
- 2School of Optometry and Vision Science and Vision Cooperative Research Centre, University of New South Wales, Kensington, New South Wales, Australia
- 3Vistaeyes, London Circuit, Canberra, Australian Capital Territory, Australia
Correspondence: F Stapleton, School of Optometry and Vision Science and Vision CRC, Rupert Myers Building, Gate 14, Barker St, University of New South Wales, Sydney 2052, New South Wales, Australia. Tel/Fax: +02 9385 7590/7401; E-mail: f.stapleton@unsw.edu.au
Received 7 September 2006; Revised 11 April 2007; Accepted 11 April 2007; Published online 18 May 2007.
Abstract
Aim
To investigate factors affecting refractive outcome following LASIK for myopia.
Method
Six hundred and seventy-four consecutive uncomplicated myopic LASIK surgeries, performed by a single surgeon, either using the Technolas 217 planoscan (n=372) or the NIDEK EC 5000 (n=302), were evaluated. Stratified random sampling was used to match the groups for refractive error, patient age, and gender. The final analysis included 302 patients from each treatment group. Conditions were identical for both surgeries, and pre-operative refractive errors were between -1.00 and -14.00 DS and <-1.50 DC. Refractive success was defined as -0.50 to +0.50 DS of the targeted refraction measured 3 months after surgery. A stepwise logistical regression analysis was used to determine variables associated with refractive failure.
Results
A successful refractive outcome was achieved in 78% (235/302) of surgeries using the Technolas laser and in 88% (266/302) using the NIDEK laser. Predictor variables for not achieving refractive success were pre-operative refractive error of above -5.00 DS, age more than 40 years, and surgery performed with the Technolas laser.
Conclusion
Both the Technolas 217 and the NIDEK EC-5000 excimer lasers achieve a successful refractive outcome in the majority of cases. However, patient and surgical factors can influence refractive outcome.
Keywords:
LASIK, refractive outcome, myopia, excimer laser
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