Clinical trials: Astigmatism,
Ametropia, Myopia
Apioc Contact Lens Feasibility
This clinical trial will document the feasibility of the Apioc lens design by assessing which lens shape parameters yield successful on-eye-fit and movement of the Apioc contact lens design and evaluate the subjectively-reported…
- Conditions
- Ametropia, Myopia, Hyperopia, Astigmatism
- Trial name
- NCT03688672
- Testing
- Apioc Contact Lens Design
- Where
- United States
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- Lentechs, LLC
Myopia
A Prospective Evaluation of Contrast Sensitivity and Disability Glare in Refractive Surgery, a Sub-Study of: Initial Evaluation of Excimer Laser Keratorefractive Surgery in U.S. Army Personnel (WU # 2335-99)
The purpose of this study is to conduct a prospective assessment of small target contrast sensitivity and disability glare in refractive surgery.
- Trial name
- NCT00413868
- Testing
- LASIK, PRK, Small target contrast sensitivity and disability glare
- Where
- United States
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- Walter Reed Army Medical Center
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
Myopia, Hyperopia
Corneal Epithelial Thickness Mapping by Anterior Segment Optical Coherence Tomography in Patients With Refractive Errors
This study evaluates corneal epithelial thickness using anterior segment optical coherence tomography (AS-OCT) in patients with refractive errors.
- Conditions
- Myopia, Hyperopia, Astigmatism, Emmetropia
- Trial name
- NCT07647146
- Where
- Egypt
- Volunteers
- 360 people, healthy volunteers welcome
- Sponsor
- Sohag University
Cataract, Astigmatism
Patient Perception of Visual Distortions
The purpose of this study is to evaluate visual distortions reported by pseudophakic patients.
- Trial name
- NCT02203747
- Testing
- Administration of patient self-assessment
- Where
- United States
- Volunteers
- 79 people, healthy volunteers welcome
- Sponsor
- Abbott Medical Optics
Blepharoptosis
Astigmatic Changes Secondary to Eyelid Surgeries
Eyelid surgeries change the lid position over the cornea. Previous surgeries evaluated astigmatic corneal changes in children undergoing ptosis repair.
- Trial name
- NCT01968174
- Where
- 3 sites in Israel
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Meir Medical Center
Myopia
Corneal Refractive Therapy Design Comparison for -4 to -6 Diopter Treatment for Overnight Wear for Myopia
The primary objective of this study is to compare the effectiveness of two proximity control geometry lens designs to treat eyes with pretreatment myopia between -4.00 and -6.00 D myopia with and without refractive astigmatism in…
- Trial name
- NCT05438615
- Testing
- Corneal Refractive Therapy-spherical, Corneal Refractive Therapy-aspherical
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- CooperVision International Limited (CVIL)
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.
Cataract, Nuclear Sclerosis
Evaluating the Need for the Pseudophakic Intraoperative Abberrometry in Toric IOL Implantation
To determine clinically significant difference in results obtained from cataract surgery using IA. One eye will receive aphakic measurements only and the fellow eye will receive aphakic and then pseudophakic measurements when…
- Conditions
- Cataract, Nuclear Sclerosis, Cortical Cataract, Posterior Subcapsular Cataract
- Trial name
- NCT03819842
- Testing
- Pseudophakic Measurement
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Alterman, Modi, & Wolter Ophthalmic Physicians & Surgeons
Myopia, Astigmatism
A Three-Phase Contralateral Comparison of Ray-Tracing Guided LASIK Versus Three Other Refractive Surgery Platforms to Correct Myopia or Myopia With Astigmatism
This purpose of this study is to compare a new form of LASIK called Ray Tracing Guided LASIK to 3 other forms of corneal refractive surgery: 1. KLEx (KeratoLenticule Extraction) using the Zeiss Visumax 800 Laser, 2.
- Trial name
- NCT07201298
- Testing
- Ray-Tracing Guided LASIK, Keratorefractive Lenticule Extraction (KLEx), WaveFront Optimized LASIK
- Where
- United States
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Hoopes Vision
Cataract, Pseudophakia
Evaluation Study for a Non-Contact Biometer
The purpose of this study is to determine whether a new non-contact biometer, is as accurate as the the available gold-standard.
- Conditions
- Cataract, Pseudophakia, Myopia, Hyperopia
- Trial name
- NCT00494390
- Where
- Switzerland
- Volunteers
- 95 people, healthy volunteers welcome
- Sponsor
- Insel Gruppe AG, University Hospital Bern
Astigmatism
Evaluation of the Bausch & Lomb PureVision Under Nighttime Driving Conditions
The objective of this study is to quantify differences in nighttime driving performance between the Bausch \& Lomb PureVision™ aspheric contact lenses and a conventional spherical contact lens.
- Trial name
- NCT00581659
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- University of Iowa
Contact Lens Comfort
Acuvue Oaysis Contact Lens Wearers Being Refit Into P7 Contact Lenses
Determine the likelihood of successfully refitting a satisfied AOA CL wearers into P7A CLs
- Trial name
- NCT06955403
- Testing
- Precision 7 contact lenses
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Southern College of Optometry
Myopia, Hyperopia
Clinical Investigation of the Vision-R800 Device.
Randomized, bilateral, cross-over dispensing study of a standard and VR800 refraction and associated spectacle lenses.
- Conditions
- Myopia, Hyperopia, Astigmatism, Presbyopia
- Trial name
- NCT04208750
- Testing
- Vision R-800 Phoropter, Standard Phoropter
- Where
- United States
- Volunteers
- 119 people, healthy volunteers welcome
- Sponsor
- Pete Kollbaum, OD, PhD
Myopia, Astigmatism
A Comparison of LASIK Outcomes Using Two Femtosecond Lasers
Comparing LASIK outcomes using two femtosecond lasers
- Trial name
- NCT03063164
- Testing
- Intralase IFS150, Visumax
- Where
- United States
- Volunteers
- 7 people, healthy volunteers welcome
- Sponsor
- Edward E. Manche
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
Myopia, Myopic Astigmatism
Optical Quality, Threshold Target Identification, and Military Target Task Performance After Advanced Keratorefractive Surgery
To determine the effect of two types of wavefront modalities (WFG vs. WFO) and two types of refractive surgery (PRK vs. LASIK) on visual and military task performance after laser refractive surgery.
- Trial name
- NCT01097525
- Testing
- WFG PRK, WFG LASIK, WFO PRK
- Where
- 2 sites in United States
- Volunteers
- 224 people, healthy volunteers welcome
- Sponsor
- Fort Belvoir Community Hospital
Astigmatism
Pseudophakic Astigmatic Reduction With Verion-LenSx Arcuate Incisions
To assess the effectiveness of the Verion-LenSx guided arcuate incision technique to reduce astigmatism in a pseudophakic population.
- Trial name
- NCT02763124
- Testing
- Verion-LenSx
- Where
- United States
- Volunteers
- 18 people, healthy volunteers welcome
- Sponsor
- Gainesville Eye Associates
Hypermetropia
Use of the VisuMax Femtosecond Laser Lenticule Removal Procedure for the Correction of Hyperopia
The correction of farsightedness using ReLEx SMILE for hyperopia is focus of this investigation. The objective is to evaluate the safety and effectiveness.
- Trial name
- V1601CI (NCT03431571)
- Testing
- ReLEx SMILE
- Where
- 8 sites in China, Czechia and 4 more
- Volunteers
- 374 people, healthy volunteers welcome
- Sponsor
- Carl Zeiss Meditec AG
Astigmatism
Wear Experience With Daily Disposable Contact Lenses for Astigmatism Over a Long-Wear Day
The purpose of this study to assess the wear experience of people who have astigmatism when wearing a daily disposable contact lens for astigmatism over long days of wear.
- Trial name
- NCT07303920
- Testing
- Daily disposable contact lenses for astigmatism
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Ohio State University