- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00541177
Study of Myopia Prevention in Children With Low Concentration of Atropine
Pilot Study of Prevention Myopia in Children With Low Concentration of Atropine
Study Overview
Detailed Description
The prevalence rate of myopia is rising rapidly in several Asian countries. A prevalence survey conducted in 1995 of 11178 school children in Taiwan were 12 percent for six year old and 84 percent for teenagers 16 o 18 years. Among them, twenty percent were high myopes. While in the United States and Europe the prevalence rate in older adults is 20% to 50%. The rate of progression of myopia is highest in young children, and the average age of stabilization of myopia is approximately 16 years.The onset of myopia may occur at a relatively young age, leading to higher risks of high myopia (myopia at least 6.0 diopters ) in adulthood. High myopia is associated with potentially blinding complications. Therefore, prevention of myopia progression is important in Taiwan, especially in young children.
There is some evidence that atropine eyedrops retard myopia progression in three randomized clinical trials. It is believed that atropine act on muscarinic receptor located in the sclera and through some unknown mechanism retard the elongation rate of axial length. However, the possible long-term side effects such as cataract formation and retinal toxicity, are largely unknown. Photophobia in daily life, accommodation difficulty both decrease the acceptance of atropine usage and compliance.
There are some evidence that the rate of axial elongation of eyeball are different between pre-myopic stage and myopic stage. Therefore, if we can use low concentration of atropine eyedrops before myopia development. Maybe we can prevent abnormal axial length elongation with lower dosage of atropine eyedrops compared with daily use of atropine eyedrops in true myopia stage.
Clinical study was conducted by randomized control trial. 60 school-aged children were recruited ( Age 7 to 12 years ). All with pre-myopia ( spherical equivalent between +0.50 and -0.75 ) after cycloplegic refraction. Visual acuity of naked eyes are above 0.6. None of them had tropia, amblyopia, eyelid disease, ocular problems. The astigmatism was less than -1.0D and anisometropia was less than 1.0D. The children were randomly assigned into two groups by using randomized consent design. The first group use 0.25% atropine once a week. The second group keep traditional treatment using 0.5% tropicamide eyedrop every day. All children had complete ophthalmologic examination before enrollment. Follow-up examinations were performed every 3 months for 12 months duration. These examinations included visual acuity of naked eye. Intraocular pressure, refractive status. The cycloplegic refraction and axial length were measured every 6 months.
Study Type
Enrollment (Anticipated)
Phase
- Phase 4
Contacts and Locations
Study Contact
- Name: Leon Chih-Kai Liang, MD MMS
- Phone Number: 8333 03-3179599
- Email: eye.care@msa.hinet.net
Study Locations
-
-
-
Tao-Yuan, Taiwan
- Recruiting
- Min-Sheng General Hospital
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Aged 7 to 12 years old
- Has pre-myopia (spherical equivalent between +0.50 and -0.75) after cycloplegic refraction.
- Visual acuity of naked eyes are above 0.6.
- Astigmatism is less than -1.0D and anisometropia less than 1.0D.
Exclusion Criteria:
- Has tropia, amblyopia, eyelid disease, or ocular problems.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Single
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: 1
use 0.25% atropine once a week
|
0.25% atropine
|
Active Comparator: 2
use 0.5% tropicamide everyday
|
0.5% tropicamide
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
cycloplegic refraction, visual acuity
Time Frame: one year
|
one year
|
Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
axial length
Time Frame: one year
|
one year
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Leon Chih-Kai Liang, MD MMS, Min-Sheng General Hospital; National Yang-Ming university, Taiwan
Study record dates
Study Major Dates
Study Start
Study Completion (Anticipated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
- Eye Diseases
- Refractive Errors
- Myopia
- Physiological Effects of Drugs
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Anti-Arrhythmia Agents
- Parasympatholytics
- Autonomic Agents
- Peripheral Nervous System Agents
- Muscarinic Antagonists
- Cholinergic Antagonists
- Cholinergic Agents
- Adjuvants, Anesthesia
- Bronchodilator Agents
- Anti-Asthmatic Agents
- Respiratory System Agents
- Mydriatics
- Atropine
- Tropicamide
Other Study ID Numbers
- IRB960209-3
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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