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LASIK Surgery (lasik + surgery)

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Medical Sciences	100%

Selected Abstracts

3232: Safety and efficacy of femtosecond LASIK with reverse side cut

ACTA OPHTHALMOLOGICA, Issue 2010
F MENICACCI
Purpose Laser in situ keratomileusis has several advantages over photorefractive keratectomy when performed properly in appropriate eyes. These include faster visual recovery, less discomfort after surgery, and milder and more predictable wound healing with less risk for haze. Lamellar corneal flap formation is the critical step in successful LASIK surgery. In our study we used femtosecond lasik with 90° hinge and 100 µm thickness flap wi Methods We performed femtosecond lasik in 58 eyes of 30 patients (mean age 35 y.o.) with AMO's IntraLaseÔ FS and STAR S4 IRÔ Excimer Laser System. Criteria for inclusion were spherical myopia of -2 to -8.00 D, hyperopia up to 5 D, astigmatism miopic/hyperopic up to 4.50 D; stable refraction for 2 years; a best-spectacle corrected vision (BSCVA) of at least 20/25 in each eye. Corneal flap thickness was 100µm and hinge position was 90 degrees with reverse 120° side cut. The optical zone of the ablation was from 6.5 to 7 mm, transition zone from 8 to 9 mm. Results Controls were made at 1day, 1 and 3 months. No flap decentration was observed in any case, we had one case of epithelial sloughing and one slightly irregular flap border. Spherical equivalent was within +/- 0.50 D and the cylinder was 0.50 D or less in all patients. Only 5% of patients showed marked discomfort and avversion to light for several days. Conclusion Flap creation is probably the most important step during laser in situ keratomileusis (LASIK), and complications during it can affect the rest of the procedure and cause permanent visual loss. In our exeprience the use of 100µm thickness flap with oblique side cut demonstrated itself to be a safe procedure with a very low complications rate and good refractive results. [source]

LASIK after retinal detachment surgery

ACTA OPHTHALMOLOGICA, Issue 3 2006
Mohsen Farvardin
Abstract. Purpose:,To compare, in the same individuals, the safety and efficacy of laser in situ keratomileusis (LASIK) in eyes with and without previous retinal detachment surgery. Methods:,In a prospective clinical trial, seven myopic patients who had previously undergone scleral buckling surgery in one eye underwent conventional LASIK surgery in both eyes. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction, Orbscan topography and pachymetry were recorded before and 1, 3, 6 and 12 months after surgery. The eyes were divided into two groups: group 1 consisted of eyes that had undergone previous surgery for retinal detachment, and group 2 consisted of the fellow eyes of the same patients, which had not undergone any previous ocular surgery. Student's t -test for match-paired data was used to evaluate the significance of differences. Results:,LASIK was performed successfully in all patients. The UCVA improved in all eyes in both groups. The mean change in the spherical equivalent between 1 and 12 months after LASIK surgery was 1.7 ± 1.1 and 0.6 ± 0.5 diopter in groups 1 and 2, respectively (p = 0.019). Conclusion:,LASIK may be considered for treatment of myopia in eyes that have had previous surgery for retinal detachment. However, the risk of regression may be higher in such eyes than in eyes with no previous scleral buckling surgery. [source]

Intraocular pressure measurement in patients with previous LASIK surgery using pressure phosphene tonometer

CLINICAL & EXPERIMENTAL OPHTHALMOLOGY, Issue 2 2005
Arthur CK Cheng MRCS
Abstract Purpose:,To compare intraocular pressure (IOP) assessment in post-LASIK patients using non-contact tonometry, pressure phosphene tonometry and applanation tonometry. Methods:,Sixty-two consecutive LASIK patients were analysed preoperatively and postoperatively with non-contact, pressure phosphene and applanation tonometry. Comparisons among these values were assessed with paired sample Student t -test, Pearson's correlation test and Bland,Altman plotting. Results:,There was no significant difference for preoperative IOP measurement between non-contact, pressure phosphene and applanation tonometry. The mean ±SD difference between the preoperative non-contact tonometry and postoperative pressure phosphene tonometry IOP measurements was 0.80 ± 2.77 mmHg (P < 0.01). Postoperative applanation tonometry significantly underestimated IOP measurement by 5.45 ± 2.96 mmHg (P < 0.001) and postoperative non-contact tonometry significantly underestimated IOP measurement by 9.96 ± 2.25 mmHg (P < 0.001). Conclusion:,Pressure phosphene tonometry may provide an alternative method for the assessment of IOP in post-LASIK patients. [source]