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Astigmatism clinical trials

View clinical trials related to Astigmatism.

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NCT ID: NCT06371079 Recruiting - Myopia Clinical Trials

Safety and Suitability of ICL for Correction of Refractive Errors Without the Use of Dispersive OVDs

Start date: March 1, 2024
Phase:
Study type: Observational [Patient Registry]

The goal of this observational study is to test whether surgeries for lenses designed to be implanted in the eye to correct refractive error can be done without the need for using viscoelastic substances that are used routinely nowadays to make it easier to introduce them inside the human eye and protect the inside of the eye during the operation. The main question it aims to answer is that is it safe to do the surgery without using them? to answer this question researchers will access recorded data of patients that underwent refractive surgeries in a private clinic since 2017 and compare them as two groups: those who underwent the traditional procedures and those who had it without the use of dispersive viscoelastics in regard to their vision before and after surgery, their ocular pressure and biomicroscopic analysis of the inside of their corneas before and after surgery.

NCT ID: NCT06294795 Recruiting - Astigmatism Clinical Trials

Toric Intraocular Lens Implantation in Pediatric Cataract

TILIPC
Start date: March 1, 2024
Phase: N/A
Study type: Interventional

To evaluate the visual and refractive outcomes after an intraocular lens (IOL) implantation in pediatric eyes with cataract and preexisting corneal astigmatism

NCT ID: NCT06285695 Recruiting - Aphakia Clinical Trials

Clareon Toric Study (T2-T9)

Start date: April 4, 2024
Phase: N/A
Study type: Interventional

The purpose of this post-market study is to describe the long-term safety and performance of Clareon Toric Intraocular Lenses (IOLs).

NCT ID: NCT06256770 Recruiting - Clinical trials for Ocular Surface Disease

Evaluation of the Safety and Efficacy of Rigid Breathable Scleral Contact Lenses for the Correction of Ametropia

Start date: November 1, 2022
Phase:
Study type: Observational

To evaluate the short-term efficacy and safety of scleral contact lens in the clinical treatment of patients with irregular astigmatism after corneal transplantation by analyzing ocular parameters and ocular surface conditions of patients after corneal transplantation.

NCT ID: NCT06250855 Recruiting - Cataract Clinical Trials

Observational Prospective Clinical Investigation on Monofocal Toric Intraocular Lens

Start date: April 24, 2024
Phase:
Study type: Observational

Evaluation, at least one-year long-term, of the clinical performance and safety of Mini Toric Ready Intraocular Lens (IOL), a monofocal toric intraocular lens.

NCT ID: NCT06229301 Recruiting - Myopia Clinical Trials

A Study of Artificial Intelligence Assisted Small Incision Lenticule Extraction (SMILE) for Surgical Design and Influencing Factors

Start date: March 1, 2014
Phase:
Study type: Observational

The goal of this observational study is to learn about the difference of refractive outcomes between Artificial Intelligence and experienced surgeon predicting Nomogram assist SMILE surgical design and the influenced factors of refractive outcomes in patients who underwent Small Incision Lenticule Extraction(SMILE) at the Refractive Surgery Center of Tianjin Eye Hospital. The main questions it aims to answer are: - Compare the difference of refractive outcomes between Artificial Intelligence and experienced surgeon predicting Nomogram assist SMILE surgical design - Analysis the influenced factors of refractive outcomes

NCT ID: NCT06215807 Recruiting - Cataract Clinical Trials

Femtosecond Laser Arcuate Keratotomy Versus Toric Intraocular Lens Implantation in Cataract Surgery

Start date: October 1, 2023
Phase: N/A
Study type: Interventional

In modern cataract surgery, residual astigmatism continues to be one of the major factors influencing patients' visual quality and satisfaction. The goal of this study is to compare the clinical outcomes of femtosecond laser arcuate keratotomy in one eye and Toric intraocular lens implantation in the contralateral eye for astigmatism correction in patients undergoing femtosecond laser-assisted cataract surgery. The study is a prospective randomized comparative study. Patients with binocular regular corneal astigmatism ranging from 0.75 to 3.00 D will be recruited. The patient will randomly receive femtosecond laser arcuate keratotomy in one eye and receive Toric intraocular lens implantation in the contralateral eye. Long term evaluation will be performed to compare the visual acuity, subjective manifest refraction, and corneal topography between groups.

NCT ID: NCT06166901 Recruiting - Presbyopia Clinical Trials

Evaluation of Long-term Safety and Performance of PanOptix Intraocular Lens (IOLs)

Start date: April 27, 2024
Phase: N/A
Study type: Interventional

The purpose of this Post-Market Clinical Follow-up (PMCF) study is to describe the long-term safety and performance of the AcrySof PanOptix Trifocal toric and non-toric IOL models in subjects bilaterally implanted with these IOLs for 3 to 5 years. This study will be conducted in Spain.

NCT ID: NCT06062004 Recruiting - Refractive Errors Clinical Trials

Evaluation of Different Lenticule Diameters in Myopic Astigmatism Correction With SMILE Procedures

Start date: November 27, 2018
Phase: N/A
Study type: Interventional

Small incision lenticule extraction (SMILE) is a refractive intrastromal procedure for myopia and myopic astigmatism correction. Most of the studies evaluating astigmatic correction by SMILE reported astigmatic under-correction, especially in high degrees of astigmatism. This under-correction could be due to: first, the active eye tracker or the iris registration is not yet available to overcome the cyclotorsion that occurred during the treatment with the VisuMax femtosecond laser system (Carl Zeiss Meditec, Jena, Germany) which could be overcome by manual compensation technique, especially in higher degrees of cylinders (> 1.5 diopters (D)). Second, in patients with small lenticule diameters, the more abrupt change in thickness at the edge of the treated area could induce more stromal and epithelial healing in this area. Thus, the astigmatic correction would be less effective with small than large lenticule diameters for similar high preoperative astigmatism. This study assessed the outcome of using a 0.5 millimeter (mm) larger lenticule diameter in the fellow eyes of myopic astigmatic correction SMILE participants. This assessment included the safety and effectiveness indices, the refractive and visual outcomes, the contrast sensitivity, and some morphological outcomes such as corneal curvature and epithelial and corneal thickness.

NCT ID: NCT06059521 Recruiting - Myopia Clinical Trials

Software Refraction With Mobilerone Versus Retinoscopy

SRMR
Start date: July 15, 2023
Phase: N/A
Study type: Interventional

Software refraction in the mobilerone for myopia and astigmatism is a novel medical device for myopia adults and elder children with or without astigmatism. And the investigators would like to test its accuracy and efficacy as well as safety.