Clinical trials: Ocular Refraction
Retinopathy of Prematurity, Myopia
Prematurity and Ophthalmological Changes
Ophthalmological differences in school-aged children with and without a history of retinopathy of prematurity
- Trial name
- NCT06452524
- Testing
- axial length (AU) and anterior chamber depth (ACD), optical coherence tomography (OCT)
- Where
- Turkey (Türkiye)
- Volunteers
- 211 people, healthy volunteers welcome
- Sponsor
- Ankara City Hospital Bilkent
Refractive Error - Myopia Axial, Astigmatism
Refractive Accuracy of "2WIN" and Portable Autorefractors
Youth and some adults have photoscreening refractions and hand-held auto refraction before cycloplegia refraction during new and follow up eye examinations.
- Conditions
- Refractive Error - Myopia Axial, Astigmatism, Accomodation, Visual Impairment
- Trial name
- NCT04249505
- Testing
- "2WIN" Photoscreener, "Plusoptix A12", "Retinomax"
- Where
- United States
- Volunteers
- 708 people, healthy volunteers welcome
- Sponsor
- Alaska Blind Child Discovery
Ocular Refraction
Smart Vision Labs Autorefractor
The study is used to verify the accuracy and repeatability of Smart Vision Labs Refractor.
- Trial name
- NCT02300116
- Where
- United States
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- Smart Vision Labs
Ametropia
Optimization of a Photoretinoscopy Method for Determining the Objective Refraction of Children
The objective is to compare the refractive parameters of the photorefraction prototype device without cycloplegia with the refractive parameters of reference device, an autorefractometer with and without cycloplegia.
- Trial name
- NCT06295536
- Testing
- Comparator device, Closed-field autorefractometer
- Where
- Hong Kong
- Volunteers
- 121 people, healthy volunteers welcome
- Sponsor
- Essilor International
Myopia
Comparing Relative Peripheral Refraction on Myopia Progression
The investigators will test our hypothesis that parameters on peripheral defocus can regulate eye growth: For instance, the relative peripheral refraction measured by Multispectral Refraction Topography (MRT) would be significant…
- Trial name
- CMPMRT (NCT06758843)
- Testing
- measure the axial length, visual acuity, and refraction at follow-up of 6- and 12-month
- Where
- China
- Volunteers
- 6,000 people, healthy volunteers welcome
- Sponsor
- Fuzhou Southeast Institute of Visual Ophthalmology
Ametropia
Optimization of a Photoretinoscopy Method for Determining the Objective Refraction of Children With a Smartphone/add-on Device in India
The objective is to compare the refractive parameters of the photorefraction prototype device without cycloplegia with the refractive parameters of reference device, an autorefractometer with and without cycloplegia.
- Trial name
- NCT06524115
- Testing
- Comparator device, Closed-field autorefractometer without cycloplegia, Distance visual acuity check using objective refraction without cycloplegia, Comparator device, Closed-field autorefractometer with cycloplegia
- Where
- India
- Volunteers
- 122 people, healthy volunteers welcome
- Sponsor
- Essilor International
Refractive Errors
Correlation Between Refraction and Biometric Parameters
To document the refractive status of Chinese schoolchildren and evaluate the association between the degree of refraction and biometric parameters.
- Trial name
- NCT04346251
- Where
- China
- Volunteers
- 1,000 people, healthy volunteers welcome
- Sponsor
- Sun Yat-sen University
Myopia, Astigmatism
Comparison of Contoura Vision Outcomes Programmed Using the Manifest Refraction Verses Using Phorcides Planning Software in Patients With Oblique Astigmatism
The objective is to compare the percentage of monocular UDVA -0.1 logMAR (20/16) outcomes for each planning strategy (Phorcides and manifest refraction) at the 3-month post operative visit.
- Trial name
- NCT05888337
- Testing
- Contoura LASIK with Phorcides planning strategy, Contoura LASIK with manifest refraction planning strategy
- Where
- United States
- Volunteers
- 9 people, healthy volunteers welcome
- Sponsor
- Bismarck Lasik
Correction of Refraction Error, Attenuation of Bright Light
Contact Lenses With New UV-blocker Manufactured With Different Techniques
This study is a randomized, 4-visit, double-masked, 2x3 bilateral crossover, dispensing trial. The study lenses will be worn as daily wear (DW) for a period of two weeks each with one of the study lenses being worn twice.
- Trial name
- NCT03475875
- Testing
- senofilcon A TEST Lens, senofilcon A CONTROL Lens
- Where
- 5 sites in United States
- Volunteers
- 92 people, healthy volunteers welcome
- Sponsor
- Johnson & Johnson Vision Care, Inc.
Cataract, Dry Eye
Corneal Sensation and Incidence of Dry Eye Post Refractive Cataract Extraction With FemtoSecond Laser
The study objective is to assess changes in corneal sensation and dry eye signs and symptoms following cataract extraction/femtosecond arcuate relaxing incisions.
- Trial name
- NCT01441895
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Ophthalmic Consultants of Long Island
Accommodation
Investigational Study of Accommodation Triggering and Control to Allow for the Performance of Refraction Measurements
An investigational study in the control of the user's accommodative state via visual stimuli.
- Trial name
- NCT03957408
- Testing
- Visual Stimuli
- Where
- United States
- Volunteers
- 38 people, healthy volunteers welcome
- Sponsor
- EyeQue Corp.
Myopia,, Hyperopia,
Refraction Determination Analysis
Correlating the accuracy of a refraction done over telemedicine to that of a standard refraction, with a study hypothesis that the results will be equivalent.
- Conditions
- Myopia,, Hyperopia,, Astigmatism,, Presbyopia,
- Trial name
- NCT01995435
- Testing
- Telemedicine refraction, Traditional refraction
- Volunteers
- 30 people, healthy volunteers welcome
- Sponsor
- Lee, Steven, M.D.
Refractive Assessment, Refractive Disorders
Algorithm-assisted Subjective Refraction Program Dedicated to Children
Current refraction assessment in children is dependent on the Eye Care Specialist and lacks standardization. Essilor has developed new algorithm assisted subjective refraction software dedicated to children of 6-12 years old and…
- Conditions
- Refractive Assessment, Refractive Disorders, Hyperopia and Myopia, Astigmatism
- Trial name
- NCT07046065
- Testing
- Non-cycloplegic Objective refraction, Non-cycloplegic conventional subjective refraction, Non-cycloplegic subjective refraction (Kids refraction software vA with Vision-R™)
- Where
- Portugal
- Volunteers
- 166 people, healthy volunteers welcome
- Sponsor
- Essilor International
Myopia, Myopia, Moderate
Software Refraction With Mobilerone Versus Retinoscopy
Software refraction in the mobilerone for myopia and astigmatism is a novel medical device for myopia adults and elder children with or without astigmatism.
- Conditions
- Myopia, Myopia, Moderate, Astigmatism
- Trial name
- SRMR (NCT06059521)
- Testing
- Software refraction with Eye Test Technology in a mobilerone, Retinoscopy
- Where
- 3 sites in China
- Volunteers
- 120 people, healthy volunteers welcome
- Sponsor
- Beijing Airdoc Technology Co., Ltd.
Intraocular Lens Implantation, Cataract
Intraoperative Aberrometry vs Conventional Intraocular Lens Calculation, a Prospective Study.
the goal of this intervention study is to compare prospectively the accuracy of the power calculation between both groups, the intraoperative aberrometry (ORA) vs barrett universal II preoperative calculation (control group) .
- Conditions
- Intraocular Lens Implantation, Cataract, Humans, Ocular, Refraction
- Trial name
- ORAVSCTRL (NCT06219252)
- Testing
- Intraoperative aberrometer, Preoperative intraocular lens calculation
- Where
- Mexico
- Volunteers
- 300 people, healthy volunteers welcome
- Sponsor
- Instituto de Oftalmología Fundación Conde de Valenciana
Myopia, Hyperopia
Comparing Low-cost Handheld Autorefractors - a Practical Approach to Measuring Refraction in Low Resource Settings
Study compares four portable vision measurement and eye-imaging technologies in terms of accuracy and time and ease of use with older adult (ages 40-100) participants in a developing-country setting (India).
- Trial name
- NCT03456245
- Testing
- Vision device validation
- Volunteers
- 205 people, healthy volunteers welcome
- Sponsor
- Harvard School of Public Health (HSPH)
Children Aged 3-5 Years, Vision Screening
Shared Reading for Pediatric Ophthalmic Education
We use generative AI to make personalized books for young children about going to the eye doctor. We want to see if reading these stories helps kids feel more comfortable and improves their overall experience at the clinic.
- Conditions
- Children Aged 3-5 Years, Vision Screening, Cycloplegic Refraction
- Trial name
- NCT07590791
- Testing
- Generative AI-customized educational book, standard printed educational leaflet, Commercially available children's book
- Where
- Taiwan
- Volunteers
- 60 people, healthy volunteers welcome
- Sponsor
- Mackay Memorial Hospital
Refractive Errors
Consistency of an Automated Subjective Refraction Program Between Personnel With Diverse Professional Backgrounds and Senior Optometrists
This study aims to evaluate the performance of automated subjective refraction performed by operators with different professional backgrounds.
- Trial name
- NCT07891884
- Testing
- Nurse-Operated Automated Subjective Refraction, Village Doctor-Operated Automated Subjective Refraction, Lay Personnel-Operated Automated Subjective Refraction
- Volunteers
- 254 people, healthy volunteers welcome
- Sponsor
- Zhongshan Ophthalmic Center, Sun Yat-sen University
Refraction Error, Myopia
Age and Refraction in Predicting Myopia Progression in COVID-19
To determine the longitudinal changes of age and refraction in predicting myopia progression with risk under the coronavirus disease 2019 (COVID-19) pandemic in a 3-year follow-up of a Chinese cohort.
- Trial name
- NCT05305274
- Testing
- screening
- Where
- China
- Volunteers
- 34,400 people, healthy volunteers welcome
- Sponsor
- Tianjin Eye Hospital
Longitudinal Chromatic Aberration, Blue Light Defocus Manipulation
Application and Clinical Evaluation of Longitudinal Chromatic Aberration Technique in Ophthalmology
Our study aims to delve into the effects of shifting the focal point of blue light from video or text displayed on a terminal screen forward on the axial length of the eye, ocular blood flow, visual fatigue, and visual function…
- Trial name
- NCT06449976
- Testing
- blue light defocus and blue light filtering
- Where
- China
- Volunteers
- 21 people, healthy volunteers welcome
- Sponsor
- Beijing Tongren Hospital