Clinical trials: Contrast Sensitivity
Visual Acuity
Role of Glare and Spectral Filtering on Contrast Sensitivity: A Pilot Study
This will be a split-plot design, randomized, parallel, double-masked feasibility study to evaluate the role of a test lens on contrast sensitivity with and without glare.
- Trial name
- NCT05582304
- Testing
- Test Lens, Control Lens
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Johnson & Johnson Vision Care, Inc.
Amblyopia
Combining Donepezil With Perceptual Learning in Normal and Amblyopic Human The Effect of Donepezil on Perceptual Learning in Adult Amblyopia
The research deals with amblyopia or lazy eye, a condition that affects about 3% of the population, and results in a variety of visual deficits.
- Trial name
- NCT03109314
- Testing
- Donepezil, Single-letter training, Uncrowd training
- Where
- United States
- Volunteers
- 20 people, healthy volunteers welcome
- Sponsor
- Dennis Levi
Glaucoma
Building a Database of Results From People Without Eye Problems
The purpose of this study is to build a database of results from a new test that measures contrast sensitivity (the Spaeth-Richman Contrast Sensitivity Test (SPARCS)).
- Trial name
- SPARCS (NCT02627339)
- Where
- United States
- Volunteers
- 208 people, healthy volunteers welcome
- Sponsor
- Wills Eye
Cataract, Pseudophakia
Wavefront Analisys and Contrast Sensitivity of Spherical and Aspherical Intraocular Lenses
Purpose:To compare visual performance, total and high order wavefront aberrations (coma, spherical aberration and other terms) and contrast sensitivity in eyes implanted with one monofocal aspheric intraocular lens (IOL) and two…
- Trial name
- NCT00347243
- Testing
- phacoemulsification (cataract surgery)
- Where
- Brazil
- Volunteers
- healthy volunteers welcome
- Sponsor
- Federal University of São Paulo
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
Ptosis, Macular Degeneration
Comparing Vision Tests in a Virtual Reality Headset to Existing Analogues
The purpose of this study is to compare the results of vision tests that are algorithmically derived and delivered through a virtual reality headset with those delivered through the existing technology standards (eg.
- Conditions
- Ptosis, Macular Degeneration, Ametropia
- Trial name
- RTS1 (NCT04714424)
- Testing
- Virtual Reality Headset
- Where
- United States
- Volunteers
- 84 people, healthy volunteers welcome
- Sponsor
- Icahn School of Medicine at Mount Sinai
Hyperopic Presbyopia
Prospective Investigation of SUPRACOR Visual Outcomes of Presbyopic Hyperopic Patients With and Without Astigmatism
This phase IV study is an open, prospective, single-center, single-surgeon bilateral eye study to investigate the bilateral uncorrected intermediate visual acuity of presbyopic hyperopic patients, who have been treated with…
- Trial name
- NCT01628146
- Testing
- SUPRACOR LASIK treatment
- Where
- Ireland
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Technolas Perfect Vision GmbH
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
Dry Eye Disease
The Visual Effect of an Investigational Artificial Tear in the Tear Layer.
The purpose of this study is to investigate how the addition of a new artificial tear product when applied to the tear layer affects contrast sensitivity and optical aberrations over time.
- Trial name
- NCT00395759
- Testing
- Optiva artificial tear by Allergan
- Where
- United States
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Southern California College of Optometry at Marshall B. Ketchum University
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
Cataract, Signs and Symptoms
Spherical Aberration and Contrast Sensitivity in IOLs
Purpose: To determine whether implantation of an intraocular lens (IOL) with a modified anterior aspheric surface results in reduced spherical aberration and improved contrast sensitivity after cataract surgery.
- Conditions
- Cataract, Signs and Symptoms, Pseudophakia, Lens Diseases
- Trial name
- IOLs (NCT00576485)
- Testing
- Cataract surgery and intraocular lens implantation
- Where
- Brazil
- Volunteers
- 25 people, healthy volunteers welcome
- Sponsor
- Federal University of Minas Gerais
Intraocular Lens
Visual Outcomes and Contrast Sensitivity in Patients Implanted With Tecnis Eyhance Intraocular Lens
To compare visual outcomes for various distances, reading speed, contrast sensitivity, glare occurence, defocus curve and subjective satisfaction in patients implanted with the extended depth of focus lens (Tecnis Eyhance) in one…
- Trial name
- NCT04800887
- Testing
- TECNIS Eyhance intraocular lens, Monofocal intraocular lens Tecnis ZCB00
- Where
- Czechia
- Volunteers
- 22 people, healthy volunteers welcome
- Sponsor
- Faculty Hospital Kralovske Vinohrady
Night Vision Complaints, Decrease in Night Vision
The Safety and Efficacy of Phentolamine Mesylate Ophthalmic Solution in Subjects With Severe Night Vision Disturbances
The objectives of this study are: To evaluate the efficacy of phentolamine mesylate 0.5% and 1.0% ophthalmic solution (Nyxol) in the treatment of night vision complaints, including reduced contrast sensitivity To evaluate the…
- Conditions
- Night Vision Complaints, Decrease in Night Vision, Disturbance; Vision, Loss
- Trial name
- NCT01703559
- Testing
- Phentolamine Mesylate Ophthalmic Solution 1.0%, Phentolamine Mesylate Ophthalmic Solution 0.5%
- Where
- United States
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Opus Genetics, Inc
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
Diabetes Mellitus, Type 1, Diabetes Mellitus, Type 2
Retinal Function in Diabetic Patients Without Retinopathy
The primary purpose was to assess, in diabetic patients without diabetic retinopathy and control subjects, color vision, contrast sensitivity, electroretinography, and flicker-induced vasodilatation using the Dynamic Vessel…
- Trial name
- NEURODIAB (NCT00839150)
- Where
- France
- Volunteers
- 56 people, healthy volunteers welcome
- Sponsor
- Assistance Publique - Hôpitaux de Paris
Myopia
Effects of Blue of Glasses VS Standard Lenses on Contrast Sensitivity & Visual Fatigue in Myopic & Non-Myopic Adults
This study investigates the effects of blue light-blocking glasses compared to standard lenses on contrast sensitivity and visual fatigue in myopic and non-myopic adults.
- Trial name
- NCT06739525
- Testing
- Blue Light-Blocking Glasses (Intervention Group), Standard Lenses (Control Group)
- Where
- Pakistan
- Volunteers
- 64 people, healthy volunteers welcome
- Sponsor
- Superior University
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
Lenses, Intraocular, Contrast Sensitivity
A Pilot Study Simulating Multifocal Intraocular Lenses in Healthy Subjects
Age related cataracts are responsible for about 51 percent of blindness worldwide and according to the WHO affect about 20 million people, according to the WH .
- Conditions
- Lenses, Intraocular, Contrast Sensitivity, Visual Acuity
- Trial name
- NCT01873781
- Testing
- Cyclopentolatehydrochloride
- Where
- Austria
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Medical University of Vienna
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
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