Severity: Warning
Message: fopen(/var/lib/php/sessions/ci_session3vobsf9dm9gcoeajnquc5nabvlpn080g): Failed to open stream: No space left on device
Filename: drivers/Session_files_driver.php
Line Number: 177
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
Severity: Warning
Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)
Filename: Session/Session.php
Line Number: 137
Backtrace:
File: /var/www/html/index.php
Line: 316
Function: require_once
Purpose: To evaluate photorefractive keratectomy (PRK) in pediatric patients who fail traditional methods of treatment for myopic anisometropic amblyopia and high myopia.
Setting: Nonhospital surgical facility with follow-up in a hospital clinic setting.
Methods: Photorefractive keratectomy was performed in 40 eyes of 27 patients. The patients were divided into 4 groups based on the type of myopia: myopic anisometropic amblyopia (15 eyes/13 patients), bilateral high myopia (20 eyes/10 patients), high myopia post-penetrating keratoplasty (3 eyes/2 patients), and combined corneal scarring and anisometropic amblyopia (2 eyes/2 patients). All procedures were performed under general anesthesia using the VISX 20/20 B laser and a multizone, multipass ablation technique. Appropriate corneal fixation was achieved with appropriate head positioning (turn and tilt) and an Arrowsmith fixation ring. Myopia was as high as -25.00 diopter (D) spherical equivalent (SE), but no treatment was for more than -17.50 D SE.
Results: The mean SE decreased from -10.68 D to -1.37 D at 1 year, a mean change of -9.31 D. At 1 year, the mean best corrected visual acuity improved from 20/70 to 20/40 in the entire group. Forty percent of eyes were within +/-1.0 D of the targeted refraction. There was no haze in 59.5% of eyes. Three eyes initially had 3+ haze; 1 improved to 2+ and 2 required repeat PRK with significant haze reduction. Five eyes (3 patients) with greater than -17.00 D SE myopia before PRK (range -17.50 to -25.00 D) had 3.42 D more effect than predicted (range 0.50 to 5.50 D). A functional vision survey demonstrated a positive effect on the children's ability to function in their environments after the laser treatment.
Conclusion: Photorefractive keratectomy in children represents another method of providing long-term resolution of bilateral high myopia and myopic anisometropic amblyopia.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/s0886-3350(02)01304-4 | DOI Listing |
Front Bioeng Biotechnol
February 2025
Aragon Institute of Research Engineering (I3A), Universidad de Zaragoza, Zaragoza, Spain.
Introduction: Laser refractive surgeries are a safe option for low-to-moderate refractive corrections, providing excellent visual outcomes. Over the years, various procedures have been introduced into clinical practice, but the most performed today remain Photorefractive Keratectomy (PRK), Laser Keratomileusis (LASIK), and Small Incision Lenticule Extraction (SMILE). Although laser refractive treatments are considered safe, clinicians have focused on the risk of post-surgical ectasia, a rare but serious complication.
View Article and Find Full Text PDFBMC Ophthalmol
March 2025
Department of Ophthalmology, Kayseri City Hospital, Kayseri, Turkey.
Purpose: To analyze the refractive outcomes and changes in corneal aberrations after PRK and SMILE surgeries, and to compare these two methods.
Patients And Methods: This retrospective comparative study investigated patients aged 20-40 years who underwent SMILE or PRK for the correction of myopia between - 1.00 D and - 2.
Purpose: To evaluate the repeatability of angle kappa measurements obtained from the Pentacam (Oculus Optikgeräte GmbH), Sirius (Costruzione Strumenti Oftalmici), and Keratron Scout (BVI), and to assess the agreement with those obtained from the Amaris 750S (SCHWIND eye-tech-solutions).
Methods: This study included 110 patients scheduled to undergo transepithelial photorefractive keratectomy or femtosecond laser-assisted laser in situ keratomileusis. Before surgery, each patient underwent angle kappa measurement using three instruments: Pentacam, Sirius, and Keratron.
Purpose: To report a deep learning neural network on anterior segment optical coherence tomography (AS-OCT) for automated detection of different keratorefractive laser surgeries-including laser in situ keratomileusis with femtosecond microkeratome (femto-LASIK), LASIK with mechanical microkeratome, photorefractive keratectomy (PRK), keratorefractive lenticule extraction (KLEx), and non-operated eyes-while also distinguishing between myopic and hyperopic treatments within these procedures.
Methods: A total of 14,948 eye scans from 2,278 eyes of 1,166 patients were used to develop a deep learning neural network algorithm with an 80/10/10 patient distribution for training, validation, and testing phases, respectively. The algorithm was evaluated for its accuracy, F1 scores, area under precision-recall curve (AUPRC), and area under receiver operating characteristic curve (AUROC).
Purpose: To report a case of bilateral rainbow glare resolved by combined mechanical scraping and small ablation depth phototherapeutic keratectomy (PTK) of the laser in situ keratomileusis (LASIK) flap undersurface.
Methods: A 42-year-old man presented with symptoms of rainbow glare in both eyes after bilateral femtosecond laser-assisted LASIK 2 years prior. The LASIK flap in the left eye was relifted and PTK of 3 µm ablation depth was performed on the back surface of the flap.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!