Clinical trials: Contrast Sensitivity
Refractive Error, Cataract
Vision Measured by the Vimetrics CVA Compared With Chart Testing Under Similar Luminance and Contrast Conditions
Purpose of The Study: The purpose of this study is the following: A)To gather age-related normative visual acuity data for the Vimetrics Central Vision Analyzer (CVA, Vimetrics, LLC, Media, Pa) B)To gather visual acuity data for…
- Conditions
- Refractive Error, Cataract, Maculopathy
- Trial name
- NCT02028351
- Where
- 2 sites in United States, Austria
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- Sinclair Technologies, LLC
Myopia
Impact of Positive & Negative Lens-Induced Defocus on Contrast-Sensitivity in Myopic & Non-Myopic Adults
examines the influence of lens-induced defocus on contrast sensitivity-a crucial aspect of visual performance.Each participant experiences both positive and negative defocus through different lenses, with measurements taken for…
- Trial name
- NCT06753032
- Testing
- Positive Lens-Induced Defocus Using Spectacle Lenses (+2.00 D) for Myopic Participants, Negative Lens-Induced Defocus Using Spectacle Lenses (-2.00 D) for Myopic Participants, Positive Lens-Induced Defocus Using Spectacle Lenses (+2.00 D) for Non-Myopic Participants
- Where
- Pakistan
- Volunteers
- 36 people, healthy volunteers welcome
- Sponsor
- Superior University
Hypersensitivity
Role of Skin Tests for the Diagnosis of Immediate Hypersensitivity Reactions Due to Iodinated Contrast Media
The purpose of this trial is to study the diagnostic role of skin test in immediate reactions to iodinated radiocontrast media.
- Trial name
- NCT00819494
- Testing
- Skin tests with radiocontrast media
- Where
- Thailand
- Volunteers
- 63 people, healthy volunteers welcome
- Sponsor
- Chulalongkorn University
Amblyopia, Amblyopia, Anisometropic
Stochastic Resonance Applied to Amblyopia Training and the Plasticity of Brain
The prevalence of Taiwan's population with amblyopia is 2-5%. Amblyopia affects the daily life and learning ability. The human visual system can be developed normally with exposure of clear images on the retina, which often drive…
- Trial name
- NCT04213066
- Testing
- Portable tablet
- Volunteers
- 51 people, healthy volunteers welcome
- Sponsor
- National Cheng-Kung University Hospital
Dry Eye Syndrome
The Effect of a New Emulsion in Dry Eye Patients on Tear Layer Aberrometry, Contrast Sensitivity, and Reading Ability
The purpose of this study is to investigate how the addition of a new emulsion artificial tear to the tear layer of dry eye and normal patients affects aberrometry, contrast sensitivity, and reading ability over time.
- Trial name
- NCT01013077
- Testing
- Optive, Soothe, New Emulsion, Soothe, New Emulsion, Optive, New Emulsion, Optive, Soothe
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Southern California College of Optometry at Marshall B. Ketchum University
Cannabis Dependence
Effects of Chronic Intake of Cannabis on Contrast Sensitivity
Rates of driving under the influence of cannabis have risen in recent years. Cannabis is involved in 1/3 of motor vehicle collisions.
- Trial name
- NCT01793961
- Testing
- electroretinogram, contrast sensitivity tests
- Where
- France
- Volunteers
- 95 people, healthy volunteers welcome
- Sponsor
- University Hospital, Strasbourg, France
Myopia
Visual Outcomes and Contrast Sensitivity After Myopic LASIK
Evaluate visual outcomes and contrast sensitivity for subjects undergoing bilateral myopic LASIK procedure using the 200 kHz WaveLight® FS200 Femtosecond Laser and the WaveLight® Allegretto Wave® Eye-Q Laser.
- Trial name
- NCT01746589
- Testing
- bilateral myopic LASIK
- Where
- United States
- Volunteers
- 22 people, healthy volunteers welcome
- Sponsor
- Daniel S. Durrie, MD
Healthy Nutrition, Healthy Diet
Baylor Infant and Toddler Biomarker of Nutrition Study
Young children rely on their foods and drinks for the nutrients they need to grow, like energy, protein, vitamins, and minerals.
- Trial name
- BITBONS (NCT05869760)
- Testing
- Carotenoid Intake, Serum carotenoid concentrations
- Where
- United States
- Volunteers
- 208 people, healthy volunteers welcome
- Sponsor
- Baylor College of Medicine
Cataract, Presbyopia Correction
The Purpose is to Evaluate Visual Acuity for Distance, Intermediate and Near and Additionally Contrast Sensitivity at 25% and 10% of Illumination After Implantation of Trifocal IOL, Extended Range of Vision IOL, Bifocal IOL With Low Addition and Monofocal IOL
The objective of this study was to evaluate the effect of intraocular lens (IOL) selection on visual acuity and refractive outcomes, to assess the impact of IOL type on postoperative contrast sensitivity, and to investigate…
- Conditions
- Cataract, Presbyopia Correction, Visual Acuity
- Trial name
- IOL (NCT07008768)
- Testing
- Cataract surgery and refractive lens exchange surgery, TRIFOCAL IOL, EROV IOL
- Where
- Croatia
- Volunteers
- 131 people, healthy volunteers welcome
- Sponsor
- University Eye Hospital Svjetlost
Myopia, Dry Eye Disease (DED)
Study of Eye Fatigue From Digital Screens and Its Impact on Visual Performance in People With Normal Vision and Myopia, With and Without Dry Eye Symptoms and Signs
The goal of this observational study is to investigate the effects of eye fatigue induced by screen task on dry eye disease (DED) signs and symptoms, visual performance, and visual behavior in young adults with and without DED…
- Trial name
- RReye (NCT07844408)
- Testing
- Eye Exams, Ocular Biometry and Aberrometry, Wearing a Smartwatch
- Where
- France
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Essilor International
Cataract, Traffic Accident
Validation of Mesopic and Photopic Contrast Vision Tests With Respect to Nighttime Driving Ability
A) The main purposes of this study are (i) to develop a related virtual reality (VR) environment in order to judge the nighttime driving ability under mesopic and under glare conditions (ophthalmologically healthy subjects and…
- Conditions
- Cataract, Traffic Accident, Vision Disorders, Driving Impaired
- Trial name
- ContrastVal (NCT03169855)
- Testing
- Slit lamp (LOCS III Score)
- Where
- Germany
- Volunteers
- 54 people, healthy volunteers welcome
- Sponsor
- Aalen University
Crohn Disease, Food Allergy
Contrast-enhanced Ultrasound in Patients With Crohn´s Disease and Food Allergy
The purpose of this study is to investigate differences of the bowel wall thickness visible in conventional ultrasound and bowel perfusion using quantitative Contrast-Enhanced Ultrasound in patients with Crohn´s disease in…
- Trial name
- NCT05768971
- Testing
- Mild diet, Provocative diet
- Volunteers
- 48 people, healthy volunteers welcome
- Sponsor
- Friedrich-Alexander-Universität Erlangen-Nürnberg
Lenses, Intraocular, Glistenings
Impact of Glistenings in AcrySof Intraocular Lenses on Visual Quality
This study will assess the impact of IOL glistenings on visual quality and function in patients implanted with a single-piece AcrySof intraocular lens (IOL) that exhibits glistening formations.
- Conditions
- Lenses, Intraocular, Glistenings, Visual Quality
- Trial name
- NCT01202981
- Where
- United States
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- University of Utah
Cataract After, Astigmatism
Influence of Residual Astigmatism on Visual Acuity in Patients Undergoing Cataract Surgery With Trifocal Intraocular Lens Implantation
MAIN OBJECTIVE: To assess the influence of residual astigmatism on visual acuity in the different lens foci in patients operated on for cataracts with a trifocal intraocular lens implant.
- Conditions
- Cataract After, Astigmatism, IOL, Visual Acuity
- Trial name
- NCT04387721
- Testing
- Kind of trifocal IOL
- Where
- Spain
- Volunteers
- 48 people, healthy volunteers welcome
- Sponsor
- Enrique Ordiñaga-Monreal, OD, MSc
Allergic Rhinitis
Topical ASP-1001 (Contrast Media Formulation) and the Acute Response to Nasal Allergen Challenge (NAC)
The purpose of this study is to see whether ASP-1001 when given as a nasal spray is safe and can reduce the signs and symptoms of allergic rhinitis (hayfever) following nasal challenge with antigen.
- Trial name
- NCT00791102
- Testing
- ASP-1001 nasal spray
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- University of Chicago
Myopia
Visual Outcomes And Contrast Sensitivity After Myopic Wavefront-Optimized Lasik With Nexisvision Shield Or Bandage Contact Lens
Evaluate visual outcomes and contrast sensitivity for subjects undergoing bilateral myopic LASIK with a Nexisvision Shield or bandage contact lens placed postoperatively.
- Trial name
- NCT01706237
- Testing
- Nexisvision shield
- Volunteers
- healthy volunteers welcome
- Sponsor
- Durrie Vision
Visual Fatigue
Visual Discomfort and Reading
Reading can be an uncomfortable and difficult task for some people. Symptoms include unpleasant somatic and perceptual effects, such as eye-strain, headache, and blurred text, despite normal visual acuity.
- Trial name
- NCT00402155
- Testing
- Stress on visual discomfort
- Where
- United States
- Volunteers
- 100 people, healthy volunteers welcome
- Sponsor
- Southern California College of Optometry at Marshall B. Ketchum University
Low Vision
Performance of Rigid Gas Permeable (RGP) Scleral Contact Lenses With a Passive Artificial Iris
Data from 15 healthy subjects will be recorded in two testing sessions spread on two days, using three lens designs (A, B and C).
- Trial name
- RGPIRIS_PA (NCT04040790)
- Testing
- Scleral contact lens without a passive artificial iris, Scleral contact lens with a passive artificial iris with low contrast (<1:5), Scleral contact lens with a passive artificial iris with high contrast (>1:5)
- Where
- Belgium
- Volunteers
- 10 people, healthy volunteers welcome
- Sponsor
- University Ghent
Visual Acuity
Visual Outcomes of a Segmental Refractive Multifocal Intraocular Lens
To evaluate visual outcomes of a segmental refractive multifocal intraocular lens (IOL) after cataract surgery.
- Trial name
- NCT03452969
- Testing
- Implantation of multifocal intraocular lens
- Where
- Germany
- Volunteers
- 25 people, healthy volunteers welcome
- Sponsor
- University Clinic Frankfurt
Myopia, Moderate
To Compare the Clinical Outcomes of FemtoLASIK and ICL Implantation in Treating Moderate Myopia Focusing on Refractive Stability, Contrast Sensitivity and High Order Aberrations.
Compare the clinical outcomes of FemtoLASIK and ICL implantation in treating moderate myopia.
- Trial name
- NCT07291986
- Testing
- FemtoLASIK, ICL implantation
- Where
- Egypt
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Walid Osama Abdel Rahman Nour El Din