Clinical trials: Contrast Sensitivity
Myopia
Aberration-Free Refraction Correction
In the interest of improving visual quality after LASIK we have designed a multifaceted study to test the theoretical, physical, biomechanical and functional effects of commercial and independently designed aspherical ablation…
- Trial name
- NCT00172913
- Where
- Taiwan
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- National Taiwan University Hospital
Contrast Enhanced X-ray Based Examination
A Study, Called UV Population, to Learn More About the Safety of the Study Drug Ultravist, Which is Given to Get Clearer X-ray Pictures, in People of Different Sexes, Races, and From Different Countries/Regions
This is an observational study in which patient data from the past of people who received Ultravist prior to an X-ray based scan are studied.
- Trial name
- NCT05428397
- Testing
- Iopromide (Ultravist, BAY86-4877)
- Where
- Germany
- Volunteers
- 152,233 people
- Sponsor
- Bayer
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
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
Cataract, Lens Opacities
PMCF Study on Monofocal Toric IOL (PODEYE TORIC) in Asia
This is a single-center, prospective, open-label PMCF study whereby patients undergoing routine cataract surgery will have mono- or bilateral implantation of hydrophobic acrylic monofocal toric intraocular lens PODEYE TORIC…
- Conditions
- Cataract, Lens Opacities, Astigmatism
- Trial name
- PHY2102 (NCT04778501)
- Testing
- IOL implantation experimental
- Where
- Philippines
- Volunteers
- 45 people
- Sponsor
- Beaver-Visitec International, Inc.
Cataract and IOL Surgery
Clareon PanOptix Versus AcrySof PanOptix : Prospective Study Comparing Contrast Sensitivity
Retrospective, comparative, interventional, randomized, single-center study, contralateral (the patient's 2 eyes will be implanted: 1 CPO and the other APO) Patients presenting for cataract surgery with a request for presbyopia…
- Trial name
- CLAYRE (NCT07158177)
- Testing
- Acrysof™ PanOptix™ toric or not, trifocal IOL CE marked, Alcon company., Clareon Panoptix
- Where
- France
- Volunteers
- 40 people
- Sponsor
- Assistance Publique - Hôpitaux de Paris
High Astigmatism
Long-term Outcomes of SMILE PRO for High Astigmatism
This prospective interventional study aims to evaluate the long-term refractive and visual quality outcomes of SMILE PRO surgery in patients with myopia and high astigmatism.
- Trial name
- NCT07446751
- Testing
- SMILE PRO surgery
- Where
- Vietnam
- Volunteers
- 113 people
- Sponsor
- Hanoi Medical 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
Myopia, Child Myopia Progression
Effect of MiYOSMART iQ Spectacle Lenses on Myopia Progression in Children
This prospective, single-center study aims to evaluate the efficacy and safety of MiYOSMART iQ spectacle lenses with DIMS (Defocus Incorporated Multiple Segments) and Triple Enhanced Design (TED) technology in slowing myopia…
- Trial name
- NCT07387159
- Testing
- MiYOSMART iQ spectacle lenses
- Where
- Russia
- Volunteers
- 70 people
- Sponsor
- Hoya Lens Rus LLC
Nephrotoxicity of CT Contrast Agents, CT Scans in Those With Renal Compromise
Can Ultrasound Replace Computed Tomography (CT) Scan in Those Unable to Have Computed Tomography (CT) Contrast Agents
Computed tomography (CT) scan, performed with contrast enhancement, is one of the most commonly requested examinations in diagnostic imaging.
- Conditions
- Nephrotoxicity of CT Contrast Agents, CT Scans in Those With Renal Compromise, Sensitivity to CT Contrast Agents, US With CEUS as Replacement for Unenhanced CT Scan
- Trial name
- CEUS_CT (NCT01151566)
- Where
- Canada
- Volunteers
- 250 people
- Sponsor
- Foothills Medical Centre
Contrast Media Allergy
A Feasibility Study to Assess the Use of Gadolinium in Computed Tomography
Patients with an allergy to iodine based intravenous contrast cannot undergo a CT scan with contrast, unless they are premedicated.
- Trial name
- NCT02163005
- Testing
- Gadolinium
- Where
- United States
- Sponsor
- Massachusetts General Hospital
Contrast Sensitivity
Contrast Sensitivity Assessment in Pediatric Cataract Surgery With IOL Implantation
The study evaluates contrast sensitivity in older children following surgery for lamellar and posterior subcapsular cataracts. Often, pediatric surgeons tend to delay surgery in these children who present beyond the amblyogenic…
- Trial name
- NCT01901744
- Testing
- Cataract Surgery
- Where
- India
- Volunteers
- 25 people
- Sponsor
- Iladevi Cataract and IOL Research Center
Methods to Measure Contrast Vision
A Comparative Study of Six Methods to Measure Human Contrast Vision
This study evaluates the relative performance of different methods to measure the human spectral contrast sensitivity function (CSF).
- Trial name
- NCT02767284
- Testing
- UCST-V1, UCST-V2, UCST-V3
- Where
- Sweden
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Uppsala University
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
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
Loss of Visual Contrast Sensitivity, Near Vision
Visual Performance Following Implantation of Presbyopia Correcting IOLs
The purpose of the current study was to compare the visual performance after bilateral implantation of the Panoptix IOL , or the AT LISA IOL or Tecnis Symfony IOL .
- Conditions
- Loss of Visual Contrast Sensitivity, Near Vision, Visual Impairment
- Trial name
- NCT04907955
- Testing
- phacoemulsification with implantation of presbyopia correcting IOL
- Where
- Kuwait
- Volunteers
- 50 people
- Sponsor
- Dar Al Shifa Hospital
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
Glaucoma, Glaucoma Eye
Augmented Macular Pigment-containing Nutraceutical and Central Visual Function
The purpose of this study is to prospectively analyze changes in macular pigment optical density and dermal carotenoid levels as they relate to visual field function in patients prescribed a macular pigment-containing medical…
- Conditions
- Glaucoma, Glaucoma Eye, Glaucoma, Open-Angle
- Trial name
- NCT04676126
- Testing
- Lumega-Z, Dorzolamide Hcl 2% Oph Soln
- Where
- United States
- Sponsor
- University of the Incarnate Word
Contrast Allergies
Reactions to Contrast Media (CM) Administered at the Time of the Endoscopic Retrograde Cholangiopancreatography (ERCP)
The aim of this study is to prospectively document the incidence of CM adverse reactions at the time of ERCP and to determine whether various perceived risk factors are predictive of adverse reaction.
- Trial name
- NCT00900640
- Testing
- ERCP as medically indicated by subjects referring physician
- Where
- United States
- Volunteers
- 27 people
- Sponsor
- University of Florida
Dual Sensory Impairment of Vision and Hearing
Gaining Insight Into Dual Sensory Loss
The goal of this observational study is to explore difficulties in information access, mobility, communication and fatigue in people with combined vision and hearing impairments.
- Trial name
- DSL (NCT06362213)
- Where
- Netherlands
- Volunteers
- 300 people
- Sponsor
- Amsterdam UMC, location VUmc