Wavefront-guided Versus Standard Laser in situ Keratomileusis in Myopia Using a 213 nm Wavelength Solid-state Laser: Comparison of Higher-order Aberrations
Journal Title: Journal of Advances in Medicine and Medical Research - Year 2016, Vol 12, Issue 10
Abstract
Purpose: To assess the accuracy, efficacy, stability and safety of laser in situ keratomileusis (LASIK) for myopia and compare the pre- and post-operative changes in higher-order aberrations after wavefront-guided (WF) and standard (STD) LASIK done using the Pulzar Z1, a 213-nm wavelength solid-state laser, and determine their effects on visual acuity and refractive outcomes. Methods: This a retrospective case series composed of 80 eyes (40 patients) that had LASIK in an out-patient refractive surgery center in Manila, Philippines. Outcome measured were pre and post-operative manifest refraction spherical equivalent (MRSE), uncorrected distance visual acuity (UDVA), best-corrected distance visual acuity (CDVA), keratometry, root-mean-square (RMS) values, flap and ablation related complications. Results: The mean UDVA improved from 20/400 pre-operatively to 20/25 post-operatively. Thirty six of the 40 eyes (90%) treated with STD LASIK and 39 of the 40 eyes (97.5%) treated with WF LASIK had UDVA of 20/30 or better at 1 year post-operatively. There was a significant decrease in spherical equivalent manifest refraction post-operatively in all patients. The average spherical equivalent at 1 year is -0.43D±0.64. After twelve months of follow-up, 85.5% (34 out of the 40 eyes) of those who underwent STD LASIK and 77.5% (31 out of 40 eyes) who underwent WF LASIK had postoperative manifest refractive spherical equivalent (MRSE) of -1.0 to +1.0D. The mean difference in the attempted versus achieved refraction was not significant between the 2 groups (p = 0.32). At 12 months post-operatively, seven eyes (17.5%) gained 1 line in the WF-guided LASIK, while the rest of the eyes either showed no change in CDVA or lost 1-2 Snellen lines. The total RMS generally increased postoperatively for WF LASIK while decreased for STD LASIK, but the mean RMS difference from the pre- and post-operative values between the 2 groups were not statistically significant. None of the eyes developed flap complications during the follow-up period. Conclusion: Refractive surgery using the Pulzar Z1 213-nm wavelength solid-state laser is an effective and safe procedure in the treatment of myopia. Wavefront-guided LASIK offers no advantage over STD LASIK in improving higher-order aberrations and in achieving better visual and refractive outcomes.
Authors and Affiliations
Eleonore B. Iguban, Archimedes L. D. Agahan, Raymond P. Evangelista
Keywords
Related Articles
- EP ID EP340452
- DOI 10.9734/BJMMR/2016/22098
- Views 46
- Downloads 0
Evaluation and Comparison of the Transverse Strength of Two Heat Cure Denture Base Resins Repaired with Auto Polymerizing Resin by Wetting with Methyl Methacrylate (MMA) at Different Time Intervals - An In vitro Study
Aims: Fracture of dentures is a common clinical finding in daily prosthodontic practice, resulting in great inconvenience to both the patient and the dentist. A satisfactory repair should be cost-effective, simple to per...
Salivary α-amylase Activity and s-IgA Levels Could be Taken as a Measure of Physiological Stress in Wheelchair-dependent Persons with Physical Disabilities and Without Disability Middle-aged Persons
Aims: The s-IgA/total protein ratio and α-amylase activity in saliva have been used as indexes of stress because they change according to the physiological stress. Using both indexes, this study aimed to compare the circ...
Relating Mandibular Incisor to the Lingual Frenum in Dentulous and Edentulous (Complete Denture Wearers) Subjects: An in vitro Study
Aim and Objectives: This study is determined the vertical distance between lingual frenum and incisal edge of mandibular central incisors in dentulous subject and edentulous denture wearer subjects and their variation in...
LGIB & the Elderly: Perspective from the Developing World
Aim: To ascertain the common causes of LGIB in the elderly and to evaluate sigmoidoscopy and colonoscopy as the initial investigation for diagnosing LGIB in the elderly in the developing world. Materials and Methods: The...
Maternal Deaths in a Tertiary Health Institution in Southeast Nigeria: Two Decades after Safe Motherhood Initiative
Background: Decades after several concerted efforts were made to contain the scourge, maternal deaths continue to have a devastating effect in many developing countries. Strengthening the strategies to reduce these calam...