الفهرس 
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Abstract
Refractive surgeries emerge to provide a permanent and cosmetically accepted method for correction of refractive errors. One of the most promising and exciting developments in the world of refractive surgery has been the advent of laser in situ keratomileusis (LASIK). The surgical technique involves the creation of a hinged lamellar corneal flap, after which an excimer laser is used to make a refractive cut on the underlying stromal bed.
LASIK is presently the most widely performed refractive procedure, but it is not appropriate for all patients. Optimal re¬sults are achieved through proper patient selection, education, examination, and consent. A complete understanding of the risks of the procedure and the effects of pre-existing ocular conditions are critical in selecting patients for surgery.
A basic medical tenet is that it is better to prevent a complication than to treat it. This is perhaps magnified with LASIK, the elective nature of which makes even the slightest deviation from a perfect outcome a potential disappointment for both surgeon and patient. Proper management and counseling of the patient who experiences a complication will maximize the likelihood of a positive outcome for all concerned.
Our study included 100 eyes of 50 subjects who had LASIK correction of hypermetropia using ALLEGRETTO WAVE excimer laser.
The preoperative and postoperative examination include : uncorrected distance visual acuity (UDVA) ,subjective manifest refraction, corrected distance visual acuity (CDVA),cycloplegic refraction , slit lamp biomicroscopy& keratometry(K) .
Preoperative evaluation includes the routine evaluation of lasik subjects (Pachymetry , pentacam corneal topograghy .)
In our study preoperative MRSE ranging from +1.25 D to +7.16D (+4.11 ± 1.77 D) ,postoperative the target refraction ranging from emmetropia up to 1.00D of overcorrection and were followed up to 6 months postoperatively .
At the last follow-up visit 22 eyes (22%) can see 1.00 . likewise , 84 eyes (84%) can see 0.5 without correction and 86 eyes (86 %) with correction and all eyes can see 0.4 without correction .
In our study refractive stability was attained at the first postoperative month and the mean residual refractive error remained relatively stable at each follow-up visit.
In our study More than 90% of the eyes (90 eyes) achieved a postoperative CDVA equal to the preoperative CDVA, No eye lost more than 1 lines of CDVA .
CONCLUSION
ALLEGRETTO WAVE system can safely and effectively perform hyperopic and hyperopic astigmatic corrections.