Clinical trials: Ocular Refraction
Refractive Error
Perfecting Refraction in India With Superior Service Models
Some programs do the screening, refraction testing and provision of spectacles to children entirely in the school setting ("School Model").
- Trial name
- PRISSM (NCT03983278)
- Testing
- School Model, Referral Model, Referral Model + Cost Recovery
- Where
- 3 sites in India
- Volunteers
- 162 people
- Sponsor
- Sun Yat-sen University
Eye--Refractive Errors
Effect of Using Myopia Prediction Algorithm
In this study, the investigators aim to perform a prospective, randomized controlled study to compare the myopia development between children using myopia prediction algorithm and children without using myopia prediction…
- Trial name
- NCT04005014
- Testing
- Myopia prediction algorithm
- Volunteers
- 1,680 people, healthy volunteers welcome
- Sponsor
- Sun Yat-sen 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
Hyperopia, Hypermetropia
Enhancement of Emmetropization in Hyperopic Infants
To determine if wearing a moderate spectacle under-correction (3.00D) and performing activities designed to stimulate accurate accommodation during a 15-month period will enhance emmetropization in highly hyperopic (between…
- Conditions
- Hyperopia, Hypermetropia, Farsightedness
- Trial name
- NCT00574717
- Testing
- Spectacles
- Where
- United States
- Volunteers
- 6 people
- Sponsor
- Ohio State University
Myopia
Study of Viziatek ISL™ Refractive Phakic Intra Sulcus Lens for Refraction Adjustment in Blind Volunteers
This is a clinical investigation. A total of up to 5 subjects, but not less than 3 at one investigational site will undergo insertion of the ISL in one eye and will be followed through 6 months postoperative.
- Trial name
- NCT05518344
- Testing
- Viziatek ISL™ (hereinafter referred to as the "ISL") implanted in blind eye.
- Where
- Latvia
- Volunteers
- 4 people
- Sponsor
- Hanita Lenses
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
Myopia
The Children's WEAR Trial(Phase 1&2)
Phase I: Focus groups on different designs of adjustable glasses and standard glasses (August-September 2012) Phase II: Two-month randomized trial comparing four groups: (September 2012 - August 2013)
- Trial name
- WEAR (NCT01704729)
- Testing
- group1, group2, group3
- Where
- China
- Volunteers
- 2,300 people
- Sponsor
- Sun Yat-sen University
Myopia
Aberration-Free Refraction Correction
In the interest of improving visual quality after LASIK we have designed a multifaceted study to test the theoretical, physical, biomechanical and functional effects of commercial and independently designed aspherical ablation…
- Trial name
- NCT00172913
- Where
- Taiwan
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- National Taiwan University Hospital
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.
Myopia
Baseline Relative Peripheral Refraction in Myopia Control
Myopia has become a world concern and its prevalence has increased in recent decades. Myopic defocus has been applied for slowing down the axial elongation and myopia progression, which is mainly based on the theory of…
- Trial name
- NCT06161311
- Testing
- DIMS lenses
- Where
- Hong Kong
- Volunteers
- 80 people, healthy volunteers welcome
- Sponsor
- The Hong Kong Polytechnic University
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
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
Hyperopic Astigmatism
Effect of WRAD Lens on Axial Growth and Refraction in Low-hyperopic Chinese Children
Myopia is one of the most common visual impairments worldwide.This not only poses long-term risks to individual health but also imposes significant medical and economic burdens on society.
- Trial name
- NCT07682974
- Testing
- With-the-Rule Astigmatic Defocus Lens, With-the-Rule Astigmatic Defocus Lens (Non-plano), Single Vision
- Volunteers
- 117 people, healthy volunteers welcome
- Sponsor
- He Eye Hospital
Myopia, Refractive Error
Comparative Study of Cycloplegic Refraction and Subjective Refraction With Fogging in School Age Children
A thorough ophthalmic examination of a child must include a refraction and this is often done with cycloplegia. In our study, we aim to determine at which age group a non-cycloplegic refraction technique closely correlates with a…
- Trial name
- NCT00347347
- Where
- Singapore
- Volunteers
- 150 people, healthy volunteers welcome
- Sponsor
- Singapore National Eye Centre
Myopia, Myopia; Refractive Error
Peripheral Relative Refractive Power of Orthokeratology Lenses
Orthokeratology (OK) has been demonstrated to be an effective intervention for slowing axial elongation in children with myopia.
- Trial name
- NCT07294404
- Testing
- orthokeratology
- Where
- China
- Volunteers
- 53 people, healthy volunteers welcome
- Sponsor
- Tianjin Eye Hospital