Q value based ablation profile versus topography-guided lasik: a contralateral comparative study

Background: laser in situ keratomileusis [LASIK] has become the most widely used form of refractive surgery. The objective of this surgical technique was to modify the anterior corneal shape by ablating tissue from the stroma by means of the excimer laser after creating a hinged corneal flap. By this way, we were able to change the refractive status of the patient and provided better unaided vision. Continuous improvements in the original technique made the surgical procedure safer, more accurate and repeatable. These progressions are due to the development of novel technologies that are responsible for new surgical instrumentation, which makes the surgical procedure easier for the surgeon and better excimer laser ablation algorithms, which increase the optical quality of the ablation and thus the safety of the vision correction procedure

Aim of work: the aim of this study was to compare between Q value based ablation and topography-guided LASIK as regards safety, visual acuity, contrast sensitivity and high order aberration HOAs [spherical, coma and trefoil]

Patients and methods: this study was conducted on 60 eyes of 30 patients, thirty eyes of them underwent topography guided LASIK and the other 30 underwent Q value based ablation. Preoperative CDVA [corrected distant visual acuity] was done. Postoperative UDVA and CDVA were measured. Postoperative high order aberrations were measured 3 months postoperatively

Results: our results showed that there was no statistically significant difference between both groups as regards UDVA, spherical equivalent, high order aberrations and Strehl ratio point spread function

Conclusion: topographic guided ablation and Q value based groups provided essentially equivalent outcomes after myopic LASIK, with statistically insignificant difference between both profiles, although both laser profiles have been found to be effective, safe and predictable

Recommendations: we recommended doing more research regarding this study with larger number of cases and doing further investigations

Argon laser trabeculoplasty early treatment with timing reevaluation

Forty five eyes with chronic open-angle glaucoma were treated with argon laser trabeculoplasty at different stages of the medical treatment. In 34 eyes [76%] normalization of the intraocular pressure [21.0 mmHg] was achieved. It was successful in 27 eyes as a substitute for miotics and in 7 eyes prior use of carbonic anhydrase inhibitors. The data indicate that argon laser trabeculoplasty can he used in the early treatment of chronic open-angle glaucoma

Pars plicata lensectomy in soft cataract

Pars plicata lensectomy is a suitable operation for cataracts occurring in infants and young ages, rather than planned extracapsular technique which result in capsular clouding, or limbal approach which may result in corneal damage and difficulties in complete removal of lens material