Clinical trials: Ocular Refraction
Refractive Errors
Investigating the Effect of Using Myopia Prediction Algorithm on Myopia Children
In this study, the investigators aim to perform a prospective, randomized controlled study to compare the myopia development between myopia children using myopia prediction algorithm and myopia children without using myopia…
- Trial name
- NCT04044755
- Testing
- Myopia prediction algorithm
- Where
- China
- Volunteers
- 2,138 people, healthy volunteers welcome
- Sponsor
- Sun Yat-sen University
Refractive Surgery
Clinical Application Research of 5-Degree (0.05 D) Precision Optometry in Corneal Refractive Surgery
In recent years, the incidence of myopia has been high globally and is exhibiting a rapid upward trend, with projections estimating it will reach 49.8% by 2050.
- Trial name
- NCT07146828
- Testing
- Binocular Wavefront Optometry Machine (BWFOM, Ai-Zhitong Medical Technology Co., Ltd., Zhejiang, China)
- Where
- China
- Volunteers
- 600 people
- Sponsor
- Affiliated Hospital of Nantong University
Cataract (Post-operative Cataract Surgery Follow-up), Refraction Error
Can Tailored Surgical Incisions Reduce Refractive Error and Dependence on Glasses After Cataract Surgery?
Astigmatism is a common cause of continued dependence on glasses after cataract surgery and may lead to patient dissatisfaction with surgical outcomes.
- Trial name
- AST-2 (NCT07623317)
- Testing
- Adapted clear corneal incisions
- Volunteers
- 100 people
- Sponsor
- Linkoeping University
Myopia, Hyperopia
Clinical Investigation of the Vision-R800 Device.
Randomized, bilateral, cross-over dispensing study of a standard and VR800 refraction and associated spectacle lenses.
- Conditions
- Myopia, Hyperopia, Astigmatism, Presbyopia
- Trial name
- NCT04208750
- Testing
- Vision R-800 Phoropter, Standard Phoropter
- Where
- United States
- Volunteers
- 119 people, healthy volunteers welcome
- Sponsor
- Pete Kollbaum, OD, PhD
Refraction Error, Myopia
The MORE Study: Manifest vs. Online Refraction Evaluation
The assessment of the refractive state of the eye is a fundamental and important part of ophthalmic and optometric clinical practice.
- Conditions
- Refraction Error, Myopia, Astigmatism
- Trial name
- MORE (NCT03313921)
- Testing
- Online Manifest Refraction
- Where
- Netherlands
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- UMC Utrecht
Refractive Errors
A New More Efficient Cycloplegia Scheme
The purpose of this study is to determine whether tropicamide + phenylephrine cyclopentolate + applied for once waiting 30 minutes to retinoscopy (new scheme) is not inferior to apply cyclopentolate alone and wait 45 minutes to…
- Trial name
- NCT02177539
- Testing
- Cyclopentolate, Cyclopentolate+tropicamide+phenylephrine
- Where
- Chile
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Pontificia Universidad Catolica de Chile
Myopia
Effect of Using Myopia Prediction Algorithm on Myopia School-aged Children
In this study, the investigators aim to perform a prospective, randomized controlled study to compare the myopia development between myopia children using myopia prediction algorithm and myopia children without using myopia…
- Trial name
- NCT04045951
- Testing
- Myopia prediction algorithm
- Where
- China
- Volunteers
- 2,138 people, healthy volunteers welcome
- Sponsor
- Sun Yat-sen University
Refractive Errors, Self-Examination
Comparison of a Smartphone Based Self Refraction Tool With Conventional Refraction Error Estimation Methods
Self evaluating tools based on smartphone devices are public available on the market for each person. The tools are used to estimate the existing refractive error for each eye of a patient. Hereafter, e.g.
- Trial name
- NCT03419351
- Testing
- Smartphone, Autorefractor, Individual
- Where
- Germany
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- University Hospital Tuebingen
Refraction Error, Photorefractive Keratectomy
Comparison of Ketorolac Tromethamine 0.5%-Soaked Bandage Contact Lenses Versus Non-Medicated Bandage Contact Lenses on Postoperative Pain Control After Photorefractive Keratectomy
Photorefractive keratectomy (PRK) is a well-established surface ablation procedure for the correction of refractive errors. Despite excellent visual and refractive outcomes, postoperative pain remains a significant concern…
- Trial name
- NCT07705763
- Testing
- Ketorolac Tromethamine 0.5%-Soaked Bandage Contact Lenses, Contact Bandage Lenses
- Where
- Pakistan
- Volunteers
- 60 people
- Sponsor
- Madina Teaching Hospital Faisalabad
Cataract
Developmental Profile of Ocular Refraction in Patients With Congenital Cataract
The purpose of prospective cohort study is to describe the developmental profile of refraction change in a large cohort of Chinese CC patients.
- Trial name
- NCT02761850
- Where
- China
- Volunteers
- 1,164 people
- Sponsor
- Sun Yat-sen University
Cycloplegia
Cycloplegic Refraction Among Children
The primary outcome of this study is to compare cyclopentolate 1% and tropicamide 1% for cycloplegic refractions in pediatric populations.
- Trial name
- NCT05442801
- Testing
- Cyclopentolate, Tropicamide
- Where
- Jordan
- Volunteers
- 55 people, healthy volunteers welcome
- Sponsor
- Islamic Hospital, Jordan
Down Syndrome, Refractive Errors
Dilated Versus Non-Dilated Wavefront Corrections for Patients With Down Syndrome
Individuals with Down syndrome (DS) live with visual deficits due, in part, to elevated levels of higher-order optical aberrations (HOA).
- Trial name
- NCT05059041
- Testing
- Dilated Refraction, Non-Dilated Refraction
- Where
- 2 sites in United States
- Volunteers
- 42 people
- Sponsor
- Ohio State University
Myopia
WEAR (Wearability and Evaluation of Adjustable Refraction) III
Two-month randomized trial comparing three groups.
- Trial name
- WEARIII (NCT02529540)
- Testing
- Adjustable glasses, Custom standard glasses, Ready-made glasses
- Volunteers
- 324 people
- Sponsor
- Sun Yat-sen University
Focus on Axial Length
The Effect of 0.01% Atropine Eye Drops on Axial Length and Refraction in Myopic Children Compared to a Control Group
In this study, atropine 0.01% eye drops will be given to myopic children once at night daily for 6 months as compared to a control group to see the effect on axial length and refraction
- Trial name
- NCT07456488
- Testing
- Atropine 0.01% eye drops
- Where
- Pakistan
- Volunteers
- 60 people
- Sponsor
- Liaquat National Hospital & Medical College
2WIN-S Portable Refractor
Comparing Preschool-Aged Refractive Measurements and Amblyopia Risks Using the 2WIN-S Portable Refractor with Vision Screening by Cycloplegic Refraction in Bangkok
The goal of this diagnostic test is to compare the results of refraction and amblyopia risks between using 2WIN-S portable refractor and cycloplegic refraction in pre-school age.
- Trial name
- NCT06148519
- Testing
- 2WIN-S portable refractor
- Where
- Thailand
- Volunteers
- 250 people, healthy volunteers welcome
- Sponsor
- Department of Medical Services Ministry of Public Health of Thailand
Patient Satisfaction, Waiting Times, Patient Pathways, Effect of Lifestyle-related, Clinical and Demographic Parameters on Outcomes
Reducing Waiting Time for Vision Refraction Services
The Out-Patient Departments (OPD) is often the first point of contact for patients seeking healthcare services and involves the coordination of both administrative and clinical processes.
- Trial name
- NCT07416175
- Testing
- VRR service optimization
- Volunteers
- 350 people
- Sponsor
- Seva Canada Society
Presbyopia, Near Vision
Comparative Study and Validation of New Methodologies for Measuring Addition
The aim of this research is to collect comprehensive data on a presbyopic population that may require near vision correction, in order to identify the most useful tests to accurately determine the value of an addition.
- Conditions
- Presbyopia, Near Vision, Refraction Error
- Trial name
- NCT06963138
- Testing
- Visual Acuity, Objective refraction, Standard Subjective refraction
- Where
- France
- Volunteers
- 54 people, healthy volunteers welcome
- Sponsor
- Essilor International
Myopia, Astigmatism
Clinical Study to Evaluate Effectiveness of Digital Refraction
Prospective, comparative, randomized, non-masked clinical study to compare the a digital refraction with LogMAR VA testing utilizing trial lenses, to standard manual refraction using a Phoropter, and LogMAR VA testing, in…
- Trial name
- NCT03502863
- Testing
- Digital refraction, Manual Refraction
- Where
- 3 sites in United States
- Volunteers
- 102 people, healthy volunteers welcome
- Sponsor
- Visibly
Pupillary Dilation Effect During Cycloplegic Refraction
Comparing Efficacy and Safety of CTO0303 in Pediatric Subjects
This is a prospective randomized study compared with active control arm.
- Trial name
- NCT06609525
- Testing
- CTO0303-A, CTO0303-B, CTO0303-C
- Where
- South Korea
- Volunteers
- 156 people, healthy volunteers welcome
- Sponsor
- Taejoon Pharmaceutical Co., Ltd.
Refractive Errors
Direct Comparison of SVOne Obtained Refraction to Subjective Manifest Refraction
The purpose of the study is to compare the final glasses prescription based on refraction obtained with SVOne device to the final prescription obtained via subjective manifest refraction.
- Trial name
- NCT03222661
- Testing
- Refraction
- Where
- United States
- Volunteers
- 200 people, healthy volunteers welcome
- Sponsor
- Smart Vision Labs