Clinical trials: Refractive Errors
Refractive Error - Myopia
Does Undercorrection of Myopia Retard Myopia Progression Among Kindergarten Children?
The purpose of this study is to find out if undercorrection of myopia slow down the progression of myopia in kindergarten children.
- Trial name
- NCT00348166
- Testing
- cyclopentolate
- Volunteers
- 180 people, healthy volunteers welcome
- Sponsor
- KK Women's and Children's Hospital
Refractive Error, Presbyopia
Peripheral PresbyLASIK Using the Allegretto Wavelight System For The Treatment of Presbyopia
The aim of this study is to analyze the results of PresbyLASIK performed using the wavefront-optimized LASIK for the treatment of presbyopia on low hyperopic and low myopic patients with astigmatism.
- Trial name
- NCT01059006
- Testing
- PresbyLASIK
- Volunteers
- healthy volunteers welcome
- Sponsor
- University of California, San Diego
Refractive Error, Presbyopia
Randomized Clinical Trial of Bifocal Lenses Versus Computer-specific Progressive Addition Lenses
This is a research study designed to test the utility of D-shaped bifocal lenses and PRIO Computer Lenses for persons using a computer.
- Conditions
- Refractive Error, Presbyopia, Asthenopia, Eyeglasses
- Trial name
- NCT00585026
- Testing
- D-28 bifocal lenses and frame, Progressive addition computer lenses and frame
- Where
- United States
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- University of Alabama at Birmingham
Ametropia
Evaluation of the Performance of Non-molded Soft Contact Lenses
To evaluate the performance of the study soft lens for vision, comfort, physiology and lens surface properties.
- Trial name
- NCT00371787
- Testing
- Soft contact lens
- Where
- Canada
- Volunteers
- 38 people, healthy volunteers welcome
- Sponsor
- University of Waterloo
Refractive Error, Myopia
Mechanical Versus Alcohol Epithelial Debridement During Hotorefractive Keratectomy (PRK)
In this prospective randomized clinical trial, confocal microscopy was used to evaluate the effect of mechanical versus alcohol-assisted epithelial debridement during photorefractive keratectomy (PRK)on corneal cellular elements.
- Trial name
- NCT00918697
- Testing
- Mechanical debridement, Alcohol-assisted debridement
- Where
- Iran
- Volunteers
- 33 people
- Sponsor
- Shahid Beheshti University of Medical Sciences
Refractive Errors, Astigmatism
Study to Evaluate the Clinical Performance of SynergEyes A2 Hybrid Contact Lenses
This is a multicenter study to evaluate the clinical performance of the SynergEyes A2 lens in patients with refractive errors with or without astigmatism.
- Trial name
- NCT01058629
- Testing
- SynergEyes A2 Hybrid Contact Lens
- Where
- 10 sites in United States
- Volunteers
- 125 people, healthy volunteers welcome
- Sponsor
- SynergEyes, Inc.
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
Refractive Errors
The Effect of Gabapentin (Neurentin) and Pregabalin (Lyrica) in Pain Reduction After Photorefractive Keratectomy
The studied patients will be given randomly one of three following drugs1:Gabapentin2: Pregabalin or placebo for 3 days after Photorefractive keratectomy surgery.
- Trial name
- PRK (NCT01122004)
- Testing
- Pregabalin
- Where
- Iran
- Sponsor
- Shahid Beheshti University of Medical Sciences
Bilateral Refractive Amblyopia
Bilateral Refractive Amblyopia Treatment Study
The purpose of this study will be to: Determine the amount of visual acuity improvement with treatment of presumed bilateral refractive amblyopia Determine the time course of visual acuity improvement with treatment
- Trial name
- ATS7 (NCT00305955)
- Testing
- Spectacles
- Where
- United States
- Volunteers
- 113 people
- Sponsor
- Jaeb Center for Health Research
Refractive Error, Cataract
Improving Vision and Quality of Life in the Nursing Home
The primary purpose of this study is to evaluate whether interventions to improve vision in nursing home residents have an impact on residents' health-related quality of life.
- Trial name
- NCT00347620
- Testing
- spectacles, Cataract Surgery
- Where
- 17 sites in United States
- Volunteers
- 400 people, healthy volunteers welcome
- Sponsor
- University of Alabama at Birmingham
Refractive Errors
A Prospective Comparison of Alcon LADARVision Wavefront-guided LASIK Enhancement and Conventional LASIK Enhancement for the Correction of Residual Refractive Errors Following LASIK Procedures
The purpose of this study is to conduct a prospective clinical trial to compare conventional and WFG LASIK for enhancements on post-LASIK patients.
- Trial name
- NCT00413881
- Testing
- WAVEFRONT- GUIDED LASIK ENHANCEMENT, CONVENTIONAL LASIK ENHANCEMENT
- Where
- United States
- Volunteers
- 50 people, healthy volunteers welcome
- Sponsor
- Walter Reed Army Medical Center
Amblyopia, Strabismus
Vision In Preschoolers Study (VIP Study)
To identify vision-screening tests that can accurately predict those three- and four-year old preschoolers who would benefit from a comprehensive vision examination because of signs of amblyopia, strabismus, and/or significant…
- Conditions
- Amblyopia, Strabismus, Refractive Error
- Trial name
- NCT00038753
- Testing
- Vision Screening
- Where
- 5 sites in United States
- Volunteers
- healthy volunteers welcome
- Sponsor
- National Eye Institute (NEI)
Myopia, Hyperopia
Evaluation of Effectiveness of Correcting Refractive Error With Ready-made Spectacles
This research project will compare two methods of correcting refractive error (long or short-sightedness) with spectacle lenses.
- Conditions
- Myopia, Hyperopia, Astigmatism
- Trial name
- RECS (NCT00657670)
- Testing
- Ready-made spectacles, Spectacles
- Where
- 2 sites in China, India
- Volunteers
- 800 people, healthy volunteers welcome
- Sponsor
- Johns Hopkins University
Refractive Errors, Asthenopia
Effects of Different Add Powers on the Comfort and Productivity of Computer Users With Fixed or Free Head Movement
The aim of this study is to examine the relationship between optical blur from poor refractive corrections (glasses) of older workers using computers and their productivity and comfort in the workplace.
- Trial name
- NCT00317525
- Testing
- Spectacle Lenses
- Where
- United States
- Volunteers
- 36 people, healthy volunteers welcome
- Sponsor
- American Optometric Association
Refractive Errors
Customized PRK With Mitomycin Versus Customized Lasik for Myopic Astigmatism
The present study was designed to compare the use of mitomycin in PRK for the treatment of refractive errors and to compare these results to customized Lasik
- Trial name
- NCT00365040
- Testing
- Prk with mitomycin vs Lasik
- Volunteers
- 40 people, healthy volunteers welcome
- Sponsor
- Federal University of São Paulo
Ametropia
Contact Lens Wettability
The purpose of this study is to compare the wettability of contact lenses disinfected with three marketed contact lens care solutions.
- Trial name
- NCT00349063
- Testing
- soft contact lens, Soft contact lens multipurpose disinfection regimen
- Where
- Canada
- Volunteers
- 55 people
- Sponsor
- University of Waterloo
Refractive Error
Effects of Optical Blur on Performance and Comfort of Computer Users
The aim of this study is to examine the relationship between optical blur from poor refractive corrections (glasses) of workers using computers and their productivity and comfort in the workplace.
- Trial name
- NCT00318045
- Testing
- Eyeglass lenses
- Where
- United States
- Volunteers
- 35 people, healthy volunteers welcome
- Sponsor
- Vision Council of America
Under- and Uncorrected Significant Refractive Errors
Effectiveness of Alternative Approaches to Providing Spectacles in Tanzanian Secondary School Students
The aim of this study was to compare the effectiveness of two interventions, namely providing free spectacles or only a prescription to students with insufficiently corrected or uncorrected significant refractive errors.
- Trial name
- NCT00249275
- Testing
- spectacles
- Where
- Tanzania
- Volunteers
- 250 people
- Sponsor
- London School of Hygiene and Tropical Medicine