الفهرس 
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Abstract
- The present study was carried out to compare pupil cantered versus corneal vertex centered ablation in LASER - assisted in-situ keratomileusis (Lasik) correction of hyperopia.
- The study was conducted over 40 eyes of 20 patients with hyperopia; the ablation was centered on the pupil in 20 eyes, while it was centered on the corneal vertex in the other 20 eyes.
Exclusion criteria were: any abnormal ocular condition such as:
Nuclear sclerosis of the lens.
History of eye disease, such as glaucoma or herpetic keratitis.
Any optical opacities or pathology on slit-lamp such as corneal opacities, cataract …etc.
Previous ocular trauma or intraocular surgery.
Corneal diseases such as corneal dystrophies.
Ocular infections.
All cases had undergone through examinations including:
- Manifest refraction.
- Cycloplegic refraction.
- Slit-lamp microscopic evaluation of the anterior segment.
- Fundus examination after pupil dilatation.
- Intraocular pressure measurement using applanation tonometry (Goldmann).
- Best corrected visual acuity (BCVA) and uncorrected visual acuity (UCVA).
- Corneal topography and ultrasound pachymetry.
- The relative positions of pupil centers and corneal vertex were registered by means of topographic coordinates (dxtopo and dytopo).
- Before LASIK procedure, corneal images were obtained using high resolution pentacam.
Main outcome measures:
Primary outcome measure was the safety index. Main secondary outcome measures were efficacy index, manifest refraction, uncorrected visual acuity, best spectacle-corrected visual acuity (BCVA).
Results showed that the safety index in the pupil centered group was 0.98 ± 0.06, while it was 0.97 ± 0.07 in the vertex centered group.
Also, Results showed that the efficacy index in the pupil centered group was 0.95 ± 0.09, while it was 0.94 ± 0.09 in the vertex centered group.
At the end of this study, it was concluded that LASIK is an effective and safe procedure for treatment of hyperopia whether pupil-centered or vertex-centered.