View clinical trials related to Visual Acuity.
Filter by:This is a bilateral, non-dispensing, randomized, cross-over, single-masked study. There are a total of 3 visits where all study endpoints will be measured in all subjects at baseline with habitual lenses and under the two testing treatments sequentially in separate visits based on the randomization scheme
This is a double-masked, bilateral, randomized, non-dispensing clinical trial. The study lenses will be worn in a bilateral and random fashion using a 5x5 crossover Williams design with 5 lens types and 5 periods. The subjects will wear each pair of lenses for approximately 15 minutes with a 15 minute wash-out between each pair. Two lens types will be fit at the first visit and three lens types will be fit at the second visit. Using a computer-generated randomization scheme, each subject will randomly be assigned to 1 of 10 unique sequences of the 5 lens types. Randomization will be stratified by site.
This study is a single arm, non-randomized, open label, bilateral, non- dispensing clinical trial with only one visit. The Eye Care Providers will be provided with a fitting guide and will determine the initial study lens selection. Each subject will wear either the investigational contact lenses or marketed contact lenses for approximately 30-90 minutes. This study aims to evaluate the ECPs impression of the fitting guide for a novel multifocal lens and also their success in fitting the lenses.
This study is a non-randomized, open label, bilateral, non- dispensing clinical trial with only one visit. The Eye Care Providers will be provided with a fitting guide and will determine the initial study lens selection. Each subject will wear either the investigational contact lenses or marketed contact lenses for approximately 30-90 minutes. This study aims to evaluate the ECPs impression of the fitting guide for a novel multifocal lens and also their success in fitting the lenses.
This will be a 2 period one-day, double-masked, randomized, repeated measures, non-dispensing, cross-over study where the main purpose of this study is to compare the performance of a new daily disposable silicone hydrogel lens with that of an existing similar lens.
Interventional, parallel groups, single center trial with a prospective design
Randomized, double-masked, 5-visit, bilateral dispensing, parallel group study to demonstrate that the investigational contact lens meets the design requirements related to corneal staining, lens fit, visual acuity and rotational performance as well as subjective comfort and handling. Subjects will wear the contact lenses for a total of 28-36 days.
Nurses participate to geriatric evaluations for falling patients. For these patients, it is recommended to evaluate,especially, visual acuity but this is not currently done because it is difficult to systematically combine with an ophthalmologic consultation. The HAS french recommendations propose to detect visual acuity deficiency using Monoyer and Parinaud scales, without specifying the professional qualification. According to the nurse competence decree of State Graduates, "sensory disorders" screening is a "non-vulnerable" examination, and can be performed by nurses. Therefore, they can use these scales, after training. We propose to evaluate the correlation between visual acuity scores obtained by nurses in geriatric consultations and an ophthalmologist. This study should include 204 patients over 65 years, who have fallen at least twice in the last 12 months. These patients will benefit from an evaluation by an ophthalmologist, after the geriatric consultation.
3-visit dispensing study to evaluate the subjective feedback of a multifocal contact lens in a population of presbyopic patients. Subjects will wear the contact lenses for a total of 12-16 days.
The purpose of this study is to compare the performances of 2 bifocal IOLs and 1 trifocal IOL for far, near and intermediate vision.