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Refractive Surgery clinical trials

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NCT ID: NCT06448468 Recruiting - Refractive Surgery Clinical Trials

Analysis of Ocular Surface Microbiota in Dry Eye Patients After Refractive Surgery

Start date: May 1, 2024
Phase:
Study type: Observational

By using 16S rRNA sequencing technology to analyze the changes in ocular surface microbiota before and after surgery, as well as the impact of changes in ocular surface microbiota on refractive surgery induced DES, new treatment ideas are provided for corneal refractive surgery induced DES patients, and the incidence of refractive surgery related DES is reduced.

NCT ID: NCT06264804 Recruiting - Refractive Surgery Clinical Trials

Risk Factors for Progressive Suction Loss in Corneal Refractive Surgery

Start date: February 16, 2024
Phase:
Study type: Observational

The goal of this Prospective observational studiesis to Characteristics of progressive suction loss.

NCT ID: NCT05658718 Active, not recruiting - Refractive Surgery Clinical Trials

Factors Influencing Nocturnal Symptoms After Refractive Surgery.

Start date: November 1, 2021
Phase:
Study type: Observational

By comparing the parameters of the two groups of patients with glare at night after refractive surgery and those without glare at night, the influence of preoperative related parameters on postoperative glare was analyzed.

NCT ID: NCT05406973 Completed - Refractive Surgery Clinical Trials

Comparison Between the SBK Microkeratome Versus Femtosecond Laser in Flap Creation During LASIK Surgery for Myopia

Start date: October 1, 2019
Phase: N/A
Study type: Interventional

LASIK is the most commonly performed refractive surgery worldwide. It has been shown to be safe and effective procedure with predictable results over long term follow ups. With the advancement of technology, sub-Bowman keratomileusis allows thin flap of approximately 100 microns thickness thus preserving thicker stromal bed as compared to conventional LASIK. The femtosecond laser corneal flap has th advantage of producing a flap of uniform thickness, adjustable flap diameter, relatively few complications. The disadvantages of this procedure is the high cost of surgery, development of bubbles in the corneal layer and anterior chamber which may affect pupil trackingduring the procedure. Despite the emergence of femtosecond laser-assisted flap creation, mechanical microkeratomes remain the preferred choice in the majority of developing countries. Recent studies have shown that SBK corneal flap has the same advantages as femtosecond laser flap regarding flap uniformity, regularity, and accuracy with less suction time and cost, but with its specific complications as well.

NCT ID: NCT05060094 Completed - Refractive Surgery Clinical Trials

Comparison of Outcomes Between TransPRK and Off-flap Epi-LASIK

Start date: March 1, 2016
Phase:
Study type: Observational

To compare the quantitative and qualitative optical outcomes between single-step transepithelial photorefractive keratectomy (TransPRK) and off-flap epipolis laser in situ keratomileusis (Epi-LASIK) in moderate to high myopia.we included patients with moderate to high myopia who were randomized to have TransPRK in one eye and Epi-LASIK in the other eye. All patients underwent comprehensive ophthalmological examinations, including uncorrected (UDVA) and corrected distance visual acuities (CDVA), manifest refraction, intraocular pressure, anterior and posterior segment examination, corneal topography measured by Scheimpflug scanning-slit topographer (Pentacam, Oculus Optikgerate GmbH), contrast sensitivity (CS) under photopic and mesopic conditions (CSV-1000E, Vector Vision Inc., Greenville, OH, USA) with correction by spectacles, ocular wavefront aberrometry (OPD-Scan II, Nidek Co. Ltd). At each follow-up, CS and aberration measures were repeated 3 times and the average value was analyzed. Optical parameters were repeated 1, 3, 6, and 12 months after surgery.Statistical analysis was performed using SPSS software (version 22.0, SPSS, Chicago, Inc.). Kolmogorov-Smirnov test was used to check the normal distribution of variables. Student t-test or Wilcoxon rank sum test was used based on the normality of data. A P value less than 0.05 was considered statistically significant.

NCT ID: NCT05037370 Recruiting - Refractive Surgery Clinical Trials

CONTOURA vs WFO Ablation PRK & LASIK

Start date: April 22, 2021
Phase: N/A
Study type: Interventional

This is a prospective randomized contralateral double-masked study. Each patient will be randomized as to which eye undergoes wave-front optimized (WFO) vs. wave-front guided (WFG) during Photorefractive keratectomy (PRK) or Laser-assisted in situ Keratomileusis (LASIK) surgery to determine which ablation profile provides the best visual outcome.

NCT ID: NCT04899258 Completed - Cornea Clinical Trials

Evaluation of the Effect of Myopic Femtosecond Laser Assisted-LASIK on Anterior Chamber Flare Values and Corneal Endothelial Cells: A Prospective Before-and-After Study

Start date: December 12, 2019
Phase: N/A
Study type: Interventional

This study aimed to investigate whether femtosecond laser-assisted LASIK (FS-LASIK) surgery causes inflammation in the anterior chamber and to analyze its effect on endothelial cells.

NCT ID: NCT04684888 Completed - Refractive Errors Clinical Trials

Femto-flap Versus SBK Flap,Predictability and Variability

Start date: January 1, 2019
Phase: N/A
Study type: Interventional

Laser Insitu keratomileusis (LASIK) has become the most popular procedure for refractive error correction. Lasik flap creation is the first and critical step during LASIK surgery because of its consensual effect on a residual stromal bed, corneal biomechanics, and hence the future risk of ectasia⁴.In the current study, we compared the Visumax FSL flap thickness predictability, accuracy, and variability with the flap created by single-use Moria SBK microkeratome.

NCT ID: NCT04396990 Completed - Refractive Surgery Clinical Trials

The RESTORE Study, A Randomized, Controlled, Masked (Reading Center) Prospective Study

Start date: June 8, 2020
Phase:
Study type: Observational

To determine patient preference and treatment outcomes with an intracanalicular dexamethasone (0.4mg) insert compared to standard steroid drop regimen in the contralateral eye following bilateral PRK surgery.

NCT ID: NCT04281862 Recruiting - Refractive Surgery Clinical Trials

DEXTENZA Compared to Topical Prednisolone in Patients Undergoing Bilateral LASIK Surgery

AtLAS
Start date: January 23, 2020
Phase: Phase 4
Study type: Interventional

To determine patient preference and treatment outcomes with an intracanalicular dexamethasone (0.4mg) insert compared to standard steroid drop regimen in the contralateral eye following bilateral LASIK surgery.