Abstract
Background & aim: The studies have shown that by an increase in the aberrations and visual performance might be affected by the ocular aberrations after the corneal refractive surgery. This study was to investigate the effects of LASEK surgery on the ocular aberrations in hyperopic and hyperopic astigmatism patients.Methods: In this analytical & descriptive study 35 patients (11 men, 24 women) having LASEK surgery using the Technolas 217 z were divided into 3 groups of preoperative hyperopia as mild (+0.50-+1.75), moderate (+2.00-+3.00), and high (+3.25-+5.00). The preoperative and 6 month postoperative UCVA, BSCVA, subjective refraction, HOAs values of coma, trefoil, spherical aberration, 2nd astigmatism, quadrafoil, pentafoil, total higher-order aberrations were measured with 6mm pupils using the zywave II aberrometer. The mean spherical equivalent, hyperopia, cylinder, HOAs, and total aberrations were compared to LASEK surgery on optical qualify of the eye.Results: Total aberrations significantly decreased after hyperopic LASEK in all of groups but HOAs increased after LASEK in three groups for a 6 mm pupil, especially 4th order aberration (Z40) and 2nd astigmatism (Z42). The largest increase occurred in spherical aberration and 2nd astigmatism. The Spherical aberration (Z40) was greater for high hyperopia group with larger hyperopia and moderate astigmatism. The spherical aberration showed a shift (toward positive values) of opposite sign. The 2nd astigmatism was greater for mild and moderate hyperopia group. Postoperative UCVA was same in mild and moderate hyperopia group and better than high hyperopia group.Conclusions: Wave-front LASEK surgery using Technolas 217 Z was an effective, safe, and predictable procedure for treating hyperopic and hyperopic astigmatism patients with hyperopia up to +3.25 and astigmatism less than -3.00, but in hyperopic patients with hyperopia more than +3.25 due to a significant increase in high-order aberrations (HOAs) and further reduction of visual acuity didn't seem appropriate approach.
Highlights
The refractive errors are the most common of all vision problems in the world and have always attracted scientists
At the inception of refractive correction by refractive surgery procedures the sole purpose was correcting refractive errors and lack of dependence patients on glasses or lenses but numerous complaints voiced by patients, such as halos, monocular double vision and starburst were madescientists are looking for ways to improve the quality of their vision
The refractive errors are the most important optical defects and higher-order aberrations become of consequence only once these refractive errors are corrected [3]
Summary
The refractive errors are the most common of all vision problems in the world and have always attracted scientists. Refractive error was corrected only with glasses or contact lenses. With the advances in the wavefront analysis and laser technology, it is possible to detect and surgically correct most of the optical aberrations and refractive errors of the cornea and other ocular media [5]. Several studies have shown that the corneal higher-order aberrations (HOAs) are increased after refractive surgery. Most changes are in the anterior surface of the cornea, several groups have reported that postoperative changes arise in the posterior corneal and changes in corneal aberrations in the eye would change the total ocular aberrations and will affect the optical performance of visual system [1,6,7,8]. The studies have shown that by an increase in the aberrations and visual performance might be affected by the ocular aberrations after the corneal refractive surgery. This study was to investigate the effects of LASEK surgery on the ocular aberrations in hyperopic and hyperopic astigmatism patients
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