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Showing 1-20 of 60 trials
NCT06864858
This is a single visit, single-masked, non-dispensing, randomized, controlled, 2×2 bilateral crossover study to evaluate visual acuity.
NCT07076160
This is a 6-visit, single-masked, multi-site, 2×3 crossover, randomized-controlled, dispensing clinical trial to evaluate visual acuity.
NCT05956938
The study aims to observe the possible improvement of performance in dynamic visual acuity (DVA), in terms of speed and trajectory, comparing training using action video games and strobe glasses. The results will allow us to understand which visual training is more beneficial for improving dynamic visual acuity in athletes.
NCT05634408
This is a single-site, prospective, single-arm, open-label, real-world evidence study with a minimal study duration of 1-year, up to 2-year follow-up to evaluate overall visual acuity.
NCT07240480
The goal of this observational methodological study is to validate the Turkish version of the DDIVAT visual acuity measuring device in a Turkish-speaking adult population. The main questions it aims to answer are: Does the Turkish version of the DDIVAT provide reliable and valid visual acuity measurements in Turkish speakers? Are the results of the DDIVAT comparable to those obtained with the standard Snellen chart used in clinical practice? Researchers will compare DDIVAT visual acuity test results with Snellen chart results to see if both methods produce consistent measurements. Participants will: Be adults aged 18 years or older, including both patients and healthy volunteers. Undergo visual acuity testing using the DDIVAT system displayed on a smart TV connected to the university server. Have their visual acuity re-measured using the standard Snellen optotype under the same conditions. No medication or invasive procedure will be used. The study carries no risk to participants.
NCT06431295
The purpose of this research is to validate and determine the accuracy of the experimental device when measuring visual acuity versus our standard visual acuity measurements and to gather voice recordings of letters to help build a special system that recognizes spoken letters.
NCT06377488
This will be an open-label, 3-visit, single-arm, dispensing clinical trial to evaluate visual acuity.
NCT06968702
The ICOPE Brazil study aims to understand aging trajectories in Brazil, especially healthy aging trends based on intrinsic capacity, a collective of mental and physical capacities one may have to maintain their functional ability to execute daily life activities. Tests and questionnaires will be applied to collect data on mobility capacity, cognitive capacity, nutritional status, vision, and hearing (sensorial) capacities, and mental health. These assessments are in consonance with what the World Health Organization proposed in the Integrated Care for Older People Program (ICOPE). Participants will be followed up for three years, and the primary outcomes of interest are loss of intrinsic capacity, mobility impairment, cognitive impairment, incident depressive symptoms, loss of functional ability, incident frailty, incident sarcopenia, incident falls, hospitalization, multimorbidity, and mortality.
NCT04954833
This is a multi-center, randomized, controlled, double-masked, 2x2 cross-over, non-dispensing study to compare visual acuity and lens fit performance.
NCT03670277
This is a two-arm parallel, non-masked, bilateral, non-dispensing study with one Test arm and one concurrent, non-randomized Control arm to evaluate the one-eye optical performances of the test soft contact lens and compare with eyes treated with orthokeratology.
NCT05259163
The purpose of this study is to establish if LFR-260 (investigational device) is not inferior in effectiveness to a traditional phoropter (control device) when applied in visual acuity test in subjects undergoing a full routine eye examination. LFR-260 proposes to provide information of the visual capabilities of the patient. The test will be provided and supervised by a qualified eye care provider. The informed consent, screening, randomization (into the order of visual test device used), (visual) device testing (to include precision testing, remote and offsite testing) will all occur at a single visit.
NCT05778786
This will be a 4-visit, randomized, controlled, single-masked, bilateral wear, dispensing, 2-treatment, 2-sequence, 2-period crossover study.
NCT06019806
The aim of this research is to find the effect of forward head posture correction on visual acuity and fatigue in low level visually impaired university students. Randomized controlled trials at Cecos University of IT and Emerging Sciences would be done. The sample size would be 48. The subjects would be divided in two groups, 24 subjects Intervention group and 24 in control group. Study duration would be 6 months. Sampling technique applied would be a non-probability convenience sampling technique. Only 18-25 years low level visually impaired university students with forward head posture would be included. Tools used in the study would be asthenopia questionnaire, Snellen chart and CVA angle photogrammetry
NCT05582304
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.
NCT05480514
This is a multi-site, 4-visit, brand-masked, bilateral, 2x2 cross-over dispensing study to evaluate visual acuity.
NCT06076785
Previous investigations have demonstrated the agreement between OdySight® and standardised methods in the evaluation of near visual acuity. The app allows for remote monitoring of this parameter with tracking changes. In case of decrease in visual acuity, a notification is sent to both patient and ophthalmologist. The aim of this study is to evaluate the medical relevance of OdySight® features in the management of patients suffering from impaired visual acuity.
NCT06054763
The goal of this clinical trial is to test Buyang Huanwu Decoction in normal intra-ocular pressure glaucoma. The main question to answer is: the effect of Buyang Huanwu Decoction and its safety in patients with normal intra-ocular pressure glaucoma. Participants will take 3 grams of Buyang Huanwu Decoction or placebo for 12 weeks. Researchers will compare treatment group and placebo group to see if the visual acuity, visual field would be improved.
NCT05433571
The study is a bilateral, single-masked, single-visit, non-dispensing 2x2 crossover study to confirm a finalized design of a prototype contact lens. There will be eight study lens types, however, each subject will only be randomized to receive two study lens types.
NCT03995355
This is a double-masked, randomized, bilateral, 2-Arm parallel group study. Subjects are scheduled for 3 study visits (screening/baseline, 7-Day and 30-Day follow-up visits) over a period of one month.
NCT05300763
This study is a controlled, randomized, subject-masked, 2-arm parallel, 2-week dispensing, bilateral evaluation where the study lenses are worn for a minimum of 5 days per week and 6 hours per day.