Clinical trials: Astigmatism
Astigmatism
Orientation Characteristics of Daily Disposable Toric Contact Lenses
Brief summary: Approximately 30 soft toric contact lens adapted subjects will be enrolled in this feasibility, bilateral, randomized, double-masked (subject and investigator), repeated measures insertion study.
- Trial name
- NCT06069609
- Testing
- kalifilcon A Daily Disposable Toric, Acuvue Oasys 1-Day for Astigmatism
- Where
- United States
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Bausch & Lomb Incorporated
Myopia, Astigmatism
Wavefront-guided Photorefractive Keratectomy (PRK) Versus Wavefront-guided Lasik for Myopia
A prospective comparison of eyes undergoing wavefront-guided LASIK in one eye and wavefront-guided PRK in their fellow eye for myopia.
- Trial name
- NCT01140594
- Testing
- Photorefractive keratectomy, Laser in-situ keratomileusis
- Where
- United States
- Volunteers
- 34 people, healthy volunteers welcome
- Sponsor
- Stanford University
Astigmatism
Quantification of the Visual Benefits of Soft Toric Contact Lenses Compared to Soft Spherical Contact Lenses
The aim of this work is to undertake a range of vision-related measures with soft toric contact lenses soft spherical contact lenses and spectacle lens correction across a range of levels of astigmatism.
- Trial name
- NCT04613882
- Testing
- Soft Toric Custom Made Contact lens, Soft Spherical Contact Lenses, Spectacle Correction
- Where
- United Kingdom
- Volunteers
- 59 people, healthy volunteers welcome
- Sponsor
- CooperVision, Inc.
Myopia, Hyperopia
Evaluation of Effectiveness of Correcting Refractive Error With Ready-made Spectacles
This research project will compare two methods of correcting refractive error (long or short-sightedness) with spectacle lenses.
- Conditions
- Myopia, Hyperopia, Astigmatism
- Trial name
- RECS (NCT00657670)
- Testing
- Ready-made spectacles, Spectacles
- Where
- 2 sites in China, India
- Volunteers
- 800 people, healthy volunteers welcome
- Sponsor
- Johns Hopkins University
Ocular Surface Disease, Irregular Astigmatism
Evaluation of the Safety and Efficacy of Rigid Breathable Scleral Contact Lenses for the Correction of Ametropia
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…
- Conditions
- Ocular Surface Disease, Irregular Astigmatism, Contact Lens Complication, Corneal Astigmatism
- Trial name
- NCT06256770
- Where
- China
- Volunteers
- 176 people, healthy volunteers welcome
- Sponsor
- Tianjin Eye Hospital
Keratoconus
Astigmatism in Keratoconus Patients
Keratoconus is a bilateral (but usually asymmetrical) non-inflammatory progressive thinning process of the cornea. It manifests as characteristic cone-like ectasia of the cornea associated with irregular stromal thinning…
- Trial name
- NCT03450213
- Testing
- Pentacam
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- Assiut University
Astigmatism, Presbyopia
Comparing Biofinity Toric Multifocal to Ultra Multifocal for Astigmatism
The objective of the study was to compare the handling and performance of Biofinity Toric Multifocal to Ultra Multifocal for Astigmatism.
- Trial name
- NCT04404725
- Testing
- comfilcon A, Samfilcon A
- Where
- 7 sites in United States, Canada
- Volunteers
- 64 people, healthy volunteers welcome
- Sponsor
- CooperVision, Inc.
Myopia
Evaluation of Conventional Photorefractive Keratectomy (PRK) in U.S. Army Personnel, Substudy of: Initial Evaluation of Excimer Laser Keratorefractive Surgery in U.S. Army Personnel
The purpose of this study is to: 1. evaluate the safety and efficacy of conventional PRK in U.S. Army personnel who have naturally occurring myopia with or without astigmatism. 2.
- Trial name
- NCT00412568
- Testing
- Photorefractive Keratectomy (PRK)
- Where
- United States
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- Walter Reed Army Medical Center
Astigmatism
Performance Evaluation of Two Daily Disposable Toric Lens Designs in Habitual Soft Contact Lens Wearers
The objective of the study is to compare the clinical performance of two different daily disposable, SiHy toric contact lens types, Lens A and Lens B, in existing soft lens wearers when worn for one week each.
- Trial name
- NCT04831515
- Testing
- Lens A, Lens B
- Where
- 4 sites in United States
- Volunteers
- 48 people, healthy volunteers welcome
- Sponsor
- CooperVision, Inc.
Astigmatism
A Clinical Comparison of 2 Multifocal Toric XR (Extended Range) Contact Lenses
This study aims to compare the clinical performance and subjective acceptance of the comfilcon A and the omafilcon B soft contact lenses.
- Trial name
- NCT03006458
- Testing
- comfilcon A, omafilcon B
- Where
- United Kingdom
- Volunteers
- 24 people, healthy volunteers welcome
- Sponsor
- CooperVision, Inc.
Myopia
Evaluation of Alcon Ladarvision Wavefront-Guided PRK
The purpose of this study is to: 1. determine the safety of wavefront guided PRK 2. evaluate the efficacy of wavefront guided PRK 3. evaluate the differences in visual quality after treatment of wavefront guided PRK
- Trial name
- NCT00412295
- Testing
- Alcon Ladarvision (Wavefront-guided PRK)
- Where
- 2 sites in United States
- Volunteers
- healthy volunteers welcome
- Sponsor
- Walter Reed Army Medical Center
Ametropia, Myopia; Refractive Error
The Objective of This Study is to Evaluate the Perfomance of a Photorefraction Device for Screening Ametropia in Children. Eligible Participants Will Undergo Multiple Refractive Error Measurements, Visual Acuity and Strabismus Assessments During a Single Evaluation Visit.
The goal of this clinical trial is to evaluate the performance of a photorefraction screener in terms of sensibility, sensitivity and accuracy on children aged 3 to 8 y.o.
- Conditions
- Ametropia, Myopia; Refractive Error, Myopia; Astigmatism
- Trial name
- NCT06882408
- Testing
- Photorefraction device under investigation, Comparator device, Tabletop auto-refractometer, Comparator device, portable photorefraction device
- Where
- 2 sites in France
- Volunteers
- 315 people, healthy volunteers welcome
- Sponsor
- Essilor International
Corneal Astigmatism
Treatment of Vision Disturbances Due to Corneal Irregularities by Trans-epithelial Optical Phototherapeutic Keratectomy (TE-oPTK)
This study sets out to evaluate the EpiMaster application software for use in predicting the refractive change induced by a trans-epithelial phototherapeutic keratectomy (TE-PTK) procedure in eyes with irregularly irregular…
- Trial name
- NCT03841253
- Testing
- Trans-epithelial PTK, Trans-epithelial PTK (retrospective data collection), EpiMaster Application Software
- Where
- United Kingdom
- Volunteers
- 45 people, healthy volunteers welcome
- Sponsor
- London Vision Clinic
Amblyopia, Myopia
Performance of a Photoscreener for Vision Screening in a Haitian Pediatric Population
Screening of haitian children between the ages of 3 and 6 years old for amblyogenic risk factors with the use of the Spot photoscreener. The photoscreener results will be compared to the complete ophthalmologic evaluation.
- Conditions
- Amblyopia, Myopia, Hyperopia, Astigmatism
- Trial name
- POPH (NCT02655432)
- Testing
- Spot photoscreener, Ophthalmologic evaluation, Cyclopleged refraction
- Where
- 3 sites in Haiti
- Volunteers
- healthy volunteers welcome
- Sponsor
- Université de Montréal
Myopia, Myopia, Moderate
Software Refraction With Mobilerone Versus Retinoscopy
Software refraction in the mobilerone for myopia and astigmatism is a novel medical device for myopia adults and elder children with or without astigmatism.
- Conditions
- Myopia, Myopia, Moderate, Astigmatism
- Trial name
- SRMR (NCT06059521)
- Testing
- Software refraction with Eye Test Technology in a mobilerone, Retinoscopy
- Where
- 3 sites in China
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Beijing Airdoc Technology Co., Ltd.
Astigmatism
The Clinical Study of Silicone Hydrogel Daily Disposable Stenfilcon A Toric Lens
The aim of this study is to evaluate the clinical performance of stenfilcon A toric lenses compared with etafilcon A toric lenses for astigmatism.
- Trial name
- NCT02801006
- Testing
- stenfilcon A, etafilcon A
- Where
- 2 sites in Japan
- Volunteers
- 41 people, healthy volunteers welcome
- Sponsor
- CooperVision, Inc.
Astigmatism Bilateral
Comparison of Two Daily Disposable Soft Contact Lenses
The aim of this study was to investigate the short-term clinical performance and subjective acceptance of the two study lenses.
- Trial name
- NCT03779503
- Testing
- midafilcon A, somofilcon A
- Where
- United States
- Volunteers
- 55 people, healthy volunteers welcome
- Sponsor
- CooperVision, Inc.
Myopia
Study of the MEL 80 Excimer Laser Using LASIK in the Treatment of Moderate to High Myopia
The purpose of this study is to determine whether the MEL 80 Excimer Laser is effective in the treatment of moderate to high myopia (nearsightedness), when used as part of the Laser In Situ Keratomileusis (LASIK) procedure.
- Trial name
- NCT00762541
- Testing
- MEL 80 Treatment of High Myopia
- Where
- 5 sites in United States
- Volunteers
- 129 people, healthy volunteers welcome
- Sponsor
- Carl Zeiss Meditec, Inc.
Myopia; Astigmatism
Dispensing Evaluation of Investigational Contact Lenses
Non-randomized, single-masked, 2-visit, bilateral wear, single-arm dispensing study to evaluate the visual acuity, rotational performance, lens fit, stability and subjective characteristics of a senofilcon-based JJVCI…
- Trial name
- NCT02625220
- Testing
- Prototype toric lens senofilcon A
- Where
- 12 sites in United States
- Volunteers
- 177 people, healthy volunteers welcome
- Sponsor
- Johnson & Johnson Vision Care, Inc.
Astigmatism
Evaluating and Improving Functional Driving Vision of Patients With Astigmatism: Phase 3
It is a common clinical practice to leave small amounts of astigmatism uncorrected in contact lens wearers. Therefore, some drivers who have astigmatism and wear contact lenses may experience blur while driving.
- Trial name
- NCT02950545
- Testing
- Spherical Lenses, Toric Lenses
- Where
- United States
- Volunteers
- 51 people, healthy volunteers welcome
- Sponsor
- University of Virginia