Loading clinical trials...
Loading clinical trials...
Showing 1-20 of 49 trials
NCT05458323
The investigators aim to conduct a mixed-method study in which a randomised controlled trial (RCT) and a descriptive qualitative study will be conducted. The RCT aims to determine whether free near and distance glasses provided to residents in Hyderabad, India, aged ≥ 60 years, with under- or un- corrected refractive error and normal baseline hearing and cognition (HMSE \> 18), can improve quality of life, reduce falls, reduce depression, improve social interaction and physical activity cost-effectively over 36 months. The primary qualitative research aim is to a) contextualize the RCT with information on the milieu and culture in which the trial will be conducted; b) provide data on the lived experiences of older adults with reduced vision in the study area, and c) conduct a process evaluation of the trial. The primary outcome measure is the three-year change in cognition measured by LASI- DAD (Longitudinal Aging Study in India(LASI)- Diagnostic Assessment of Dementia(DAD) global cognitive score. Secondary Outcome Measures: Three year change in Quality of Life score measured by WHO QOL-BREF; Visual functioning from the RASCH-scaled version of INDVFQ(Indian Visual Functioning(INDVFQ);self-reported physical activity score measured using IPAQ questionnaire; PHQ9 score; domain specific cognitive score (orientation, executive function, language/fluency, memory) measured by HMSE; Total cost of care including direct and indirect costs; Quality adjusted life years; Incremental Cost Effectiveness Ratio; Number of falls measured by Quick Screen score over the three years; Social network density at 3 years (SNI 1-3 represents a "limited" social network, 4-5 is a "medium" social network, and SNI ≥6 is a "diverse" social network) measured by the SNI score; An additional secondary outcome will be LASI-DAD global cognitive score analysed by excluding any tests determined pre-hoc to depend on visual acuity.
NCT06065631
The main objective of the Sierra Leone Sees to Learn (SL2) trial is to assess the educational impact of providing free eyeglasses to students aged 9-20 years with uncorrected refractive error in Sierra Leone. The procedures include baseline questionnaires and educational assessments to collect data on students and schools, and then the provision of free eyeglasses to students who have uncorrected (or undercorrected) refractive error (URE). The questionnaires and student assessments will take 1-2 hours. The duration of the study timeframe is one school year. The end-line questionnaires and student assessments will be administered at the end of the school year.
NCT07333248
This operational research project aims to strengthen continuity of eye care delivery between community screening and hospital-based treatment in rural Assam by redesigning referral pathways from the Boko Eye Care Center (ECC) to Sri Sankaradeva Nethralaya (SSDN) base hospital. Despite active outreach in the Boko region from the Boko ECC through conducting regular outreach screenings, less than 30 percent of patients referred to the base hospital actually arrive for evaluation and less than 25 percent of those advised for surgery proceed to treatment. The proposed study addresses these gaps by examining behavioural, structural and logistical barriers to referral completion and surgical uptake, and by implementing a coordinated patient-centered referral and engagement strategy. The proposed intervention comprises of five sequential components: (1) root cause analysis to identify bottlenecks and facilitators in the current referral pathway, (2) community engagement activities to improve awareness and proactive health-seeking behaviour, (3) implementation of an integrated referral and engagement model supported by trained community team and structured referral tracking, (4) strengthening referral completion through patient navigation, scheduled transport and follow-up reminders, and (5) enhancement of surgical acceptance through standardized counseling, affordability support and social reinforcement. The outcomes will be measured prospectively, focusing on increase in hospital footfall from the Boko catchment area, proportion of referred patients who complete hospital visits, and proportion of patients who were advised for surgery and had undergone the procedure. The proposed project aims to achieve a minimum of 70 percent referral completion and 45 percent surgical conversion by the end of the 36-month study period.
NCT06996353
The objective of the clinical investigation presented to is to verify predictions of post-operative PTK-PRK refractive outcome made by the EpiMaster application software by comparing these to post-operative clinical data after routine PTK-PRK treatments.
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.
NCT06716372
This is a prospective, randomized, double-blind, parallel, active-controlled, multi-center clinical study. The purpose is to evaluate the safety and effectiveness wearing "DSiHy Silicone Hydrogel Soft Contact Lens". Subjects will be randomized in 1:1 ratio to wear either the investigational device "DSiHy Silicone Hydrogel Soft Contact Lens" or the control device Daily Silicone Hydrogel Contact Lenses(oB)".
NCT05886894
The purpose of this Post-Market Clinical Follow-Up (PMCF) study is to assess long term performance and safety of Air Optix plus HydraGlyde Multifocal soft contact lenses in a real-world setting when worn as daily wear or extended (overnight) wear.
NCT07001124
The comparative efficacy of the duochrome test versus +1 blur test in detecting refractive errors across different ages remains under-explored in current ophthalmic research. While the duochrome test is widely used to refine prescriptions, its standalone effectiveness compared to +1 blur test based refraction has not been thoroughly investigated.
NCT06112431
Individuals living in Upper Manhattan have limited access to eye care, high vision impairment rates, and poor ocular health outcomes. To improve eye care and vision health outcomes, the Eye Health Intervention Study in Upper Manhattan (EYES-UM) will conduct eye health screenings in accessible primary care health centers and senior centers and implement a behavioral intervention to improve adherence for those referred for in-office eye care. The proposed innovative, 2:1 cluster-randomized clinical trial, will recruit adults age 40 and older in Upper Manhattan with known rates of inadequate eye care. A total of 10 settings in Upper Manhattan, comprised of primary care offices, senior centers, and organizations, confirms access to 17,000 individuals living at or below the NYC.gov poverty measure. This study will conduct ocular tests (visual acuity, intraocular pressure, fundus images) during screenings. To ensure that all participants receive the basic level of service, all participants who fail the eye health screening will be seen the same day by a study optometrist and eyeglasses will be provided at no charge. Educational workshops and an Advisory Board will support recruitment. Intervention Arm participants will receive ongoing support with scheduling eye exams and transportation by trained Study Coordinators. All participants will be followed prospectively for 2 years. The study is guided by the Reach, Effectiveness, Adoption, Implementation, and Maintenance (RE-AIM) Framework. Conducting Focus Groups with health policy stakeholders ensures iterative input during the study to bridge and translate EYES-UM findings into a Vision Health Policy Roadmap for scalable implementation of vision care delivery models, focusing on adherence.
NCT05550740
The purpose of this clinical trial is to confirm the incidence and magnitude of axial length shortening after RLRL therapy in Chinese high myopia children and teenagers.
NCT05670626
This prospective non-comparative interventional study aims to analyse the pre-operative factors affecting the range of optimal ICL vaulting. the main question is what is the correlation between age, gender, spherical equivalent, white to white, anterior chamber volume and depth and postoperative vault? participants will do preoperative investigations ( specular microscopy, pentacam and biometry ) then refractive surgery (ICL implantation) followed by follow-up visits to assess the post-operative ICL vault and visual outcome.
NCT04077086
Chinese children are some of the most short-sighted in the world, but only one in five children in poor areas who needs glasses has them. Our team has already shown in other trials that giving children free glasses leads to better grades and that free glasses have a bigger impact on grades than factors like parents' education level and the amount of money a family has. The effect on grades from glasses is greater than from other health services in school, like giving vitamins. Only about one in three children in rural China goes on to a regular, non-vocational high school. The investigators would like to show the Chinese government strong evidence of what glasses can do to help children continue their education, in order to help convince the government to carry out national programs to provide free glasses for children who need them. Study Plan: The investigators will choose 111 middle schools at random in Liaoning, northern China, and all children in Year 1 at each school will go at random into one of two groups: either a group getting free glasses, with support from teachers to push them to wear the glasses ("Intervention") or a group getting just glasses prescriptions ("Control.") The main study outcome will be the proportion of children going on to academic (as opposed to vocational) high school, and the study is powered to detect a 10% difference in this figure between groups.The study will also assess whether children wear their glasses at school and how often they use blackboards (which disadvantage short-sighted children) vs textbooks to learn from. These other outcomes will help us to better understand the causal pathway between vision and high school attendance. We will also study the total cost of providing glasses and the teacher support to wear them per additional student attending academic high school, as well as student mental health outcomes. We will also collect data on the progression of nearsightedness. The hypothesis of this study is that providing glasses will increase academic high school attendance.
NCT06668246
This study aimed to compare refractive measurements using Vision-S™ 700, an immersive and compact phoropter with a tunable-focus lens, and Vision-R™ 800, a phoropter with a tunable-focus lens without immersion, with cycloplegic refraction serving as the gold-standard. This a retrospective study aimed to enroll 41 children, aged 6 to 16 years, who underwent refractive assessments with Vision-S™ 700, Vision-R™ 800, and cycloplegic refraction. The primary objective involves a comparison of the spherical equivalent between both devices and compared to cycloplegic refraction. Secondary outcomes include the analysis of astigmatism components (J0° and J45°) and subgroup analyses in myopic and hyperopic children.
NCT05992675
The purpose of this retrospective, Post-Market Clinical Follow-Up (PMCF) study is to assess the long term performance and safety of Air Optix® Night and Day® Aqua (AONDA) contact lenses in a real-world setting when worn as 30 days of continuous wear for vision correction.
NCT06565091
The purpose of this clinical investigation is to evaluate the clinical utility of a multifunctional measuring device for Ophtalmology. The results of this clinical investigation will be used to refine and validate the device design. 378 participants total will be included in the trial, each having only one visit at the investigation center.
NCT06335212
Purpose: Numerous studies have proven that emmetropization in young animals including humans is regulated by visual input. It has long been hypothesized that peripheral myopic defocus may act as a stop signal to reduce myopia progression and axial elongation. As such, multifocal soft contact lenses (MFCLs) have been utilized for myopia control in school-aged children, with variable efficacies. One potential explanation is that the actual peripheral myopic defocus an eye experiences during MFCL wear may not be identical to the Add power and not sufficient to reduce myopia progression. Our study investigated and compared the peripheral power profiles of myopic eyes when they were uncorrected and wore single vision contact lenses (SVCLs) and MFCLs of different Add powers. Methods: Subjects with -1.00 D to -10.00 D of myopia (SE, determined with manifest refraction) were custom fit with both single vision (SV) and MFCLs (+2.00 and +4.00 D Add; provided by Specialeyes) in both eyes. These Specialeyes MFCLs had an aspheric design with a standard total optical zone of 8.0mm. Cycloplegic central autorefraction was conducted with both Grand Seiko WAM-5500 open-field auto-refractor (Grand Seiko Co Ltd) and OPD OPD-Scan III Wavefront Aberrometer (Marco) on the subjects in the following conditions: (1) no CLs, (2) SVCLs, (3) MFCLs (+2.00D Add), and (4) MFCLs (+4.00D Add). Relative peripheral power profiles were measured using the OPD under the same 4 conditions after cycloplegia. Data in the right eye was used for analysis.
NCT05733182
This is a 12-month longitudinal randomized controlled trial aiming to evaluate the effect of colour temperature of reading lamp on refractive error development.
NCT06062004
Small incision lenticule extraction (SMILE) is a refractive intrastromal procedure for myopia and myopic astigmatism correction. Most of the studies evaluating astigmatic correction by SMILE reported astigmatic under-correction, especially in high degrees of astigmatism. This under-correction could be due to: first, the active eye tracker or the iris registration is not yet available to overcome the cyclotorsion that occurred during the treatment with the VisuMax femtosecond laser system (Carl Zeiss Meditec, Jena, Germany) which could be overcome by manual compensation technique, especially in higher degrees of cylinders (\> 1.5 diopters (D)). Second, in patients with small lenticule diameters, the more abrupt change in thickness at the edge of the treated area could induce more stromal and epithelial healing in this area. Thus, the astigmatic correction would be less effective with small than large lenticule diameters for similar high preoperative astigmatism. This study assessed the outcome of using a 0.5 millimeter (mm) larger lenticule diameter in the fellow eyes of myopic astigmatic correction SMILE participants. This assessment included the safety and effectiveness indices, the refractive and visual outcomes, the contrast sensitivity, and some morphological outcomes such as corneal curvature and epithelial and corneal thickness.
NCT06044688
Demonstrate that refraction measurements from the device agree with refraction measurements from a phoropter within clinically meaningful limits.
NCT05781997
The study aim to determine the prevalence of refractive errors in primary school children aged 6-12 in The New Valley , Egypt .