Clinical trials: Refraction Error
Cornea, Refraction Error
Corneal Topography and High Order Aberrations in Regular Contraceptive Pills
Effect of regular usage of contraceptive pills on corneal topography and corneal high-order aberrations
- Trial name
- NCT07693673
- Testing
- Hormonal Contraception, Combined Oral Contraceptive (COC)
- Where
- Egypt
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Elshimaa A.Mateen
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
Ophthalmic Diseases (Specific Types Not Restricted), Cataract
Research on a New Intelligent Mobile Screening and Diagnosis Pattern for Ocular Diseases
The global distribution of primary ophthalmic medical resources is uneven, and the traditional eye disease screening model has problems such as low efficiency, high cost and limited coverage.
- Conditions
- Ophthalmic Diseases (Specific Types Not Restricted), Cataract, Refraction Error, Diabetic Retinopathy (DR)
- Trial name
- NCT07003165
- Volunteers
- 15,000 people, healthy volunteers welcome
- Sponsor
- Zhongshan Ophthalmic Center, Sun Yat-sen University
Precocious Puberty, Early Puberty
Effect of Exogenous Growth Hormone on Ocular Findings
Body size and eye function play an essential role in adapting to the environment and human survival. Growth hormone is commonly recognized by its effect on the height of individuals; Although from an evolutionary perspective, the…
- Conditions
- Precocious Puberty, Early Puberty, Refraction Error
- Trial name
- NCT05338411
- Where
- 2 sites in Iran
- Volunteers
- 90 people, healthy volunteers welcome
- Sponsor
- Isfahan University of Medical Sciences
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
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
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.