View clinical trials related to Visual Acuity.
Filter by:Randomized, 8-visit dispensing study over 14 weeks to evaluate the safety and efficacy of an investigational contact lens with a new UV blocker compared to a marketed contact lens.
The proposed study aims to test if Gunnar computer glasses provide any advantages, in comparison to no glasses, on the following aspects in computer-related office work: - Any enhancement on visual performance of basic visual function, including visual acuity, contrast sensitivity, color discrimination, etc. - Any enhancement on visual performance of typical office work, including reading, word-spelling check, number searching, or target identification. - Any benefit in objective viewing comfort measured with viewing distance, blink frequency, post-viewing pupil size. - Any benefit in subjective viewing comfort reflected on the questionnaire of viewing symptom survey. - Any benefit in viewing comfort and visual performance with increased environmental ventilation or under strong glare. - Any benefit in life quality from daily wearing (e.g., better comfort or sleep quality).
The purpose of the study is to evaluate the efficacy and safety of CNTO 2476 cells administered into the subretinal space by the suprachoroidal surgical approach and the subretinal access kit (SRAK-02) in participants with visual acuity impairment associated with Geographic Atrophy (GA) secondary to Age Related Macular Degeneration (AMD).
Single-visit, unmasked, non-dispensing study where subjects will wear three different lenses bilaterally in one visit, each lens being worn for approximately 30-60 minutes. Subjects will complete a questionnaire for each study lens.
This is an 8-visit, bilateral, dispensing clinical study to evaluate the change in tear fluid pH and tear film osmolarity in an FDA-cleared contact lens in new contact lens users over a 14-day period.
Adaptive, randomized, subject-masked, dispensing study to evaluate the short-term, clinical performance of two FDA-approved contact lens.
This is a randomized, double-masked dispensing study where subjects will randomized into one of two lens sequences to wear each of two contact lens types for a 4-week period with each lens type.
This is a multi-site, 5-visit, double-masked, dispensing study comparing an investigational contact lens with currently-marketed contact lenses. The objective of the study is to evaluate the comfort of the lenses when worn for 30 (-2/+6) days on daily wear modality.
This is a 4-week, randomized, double-masked study where subjects will wear bilaterally test and control lenses in random succession. The objective is to evaluate materials from different suppliers.
This is a single-visit prospective study to establish a real world Marketed Contact Lens 'Through Focus Curve' (TFC) measurement by comparing the consistency of vision between myopes and hyperopes. 33 subjects will be enrolled (at least 15 myopes and 15 hyperopes), who are 40 years of age or older, for a 1-visit, 4-hour study for measurements to be taken.