Pilot Study to Assess the Efficacy of Short Exposure to Defocus to Slow the Progression of Myopia in Children
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 30
- 试验地点
- 2
- 主要终点
- Myopia progression as measured by spherical equivalent, and axial length
研究概览
简要总结
The objective of this pilot study is to establish whether brief periods of high levels of acutely imposed myopic defocus can be used to slow the progression of myopia in children, as measured by changes in spherical equivalent refraction and axial length.
详细描述
Recent results on animal models of myopia suggest that the eye has the ability to detect the overall sign of defocus of images falling on the retina, with myopic defocus imposed by the fitting of plus-lenses halting or slowing axial elongation of the eye. In the animal models, these STOP growth signals have been shown to be particularly strong - with brief periods of high myopic defocus able to outweigh the effects of prolonged periods of imposed hyperopic defocus in promoting eye growth. These results therefore suggest a novel strategy for preventing the progression of myopia in children - the imposition of high levels of myopia for brief periods of time. This approach is conceptually distinct from under-correction, which imposes chronic mild myopic defocus.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Single Group
- 主要目的
- Treatment
- 盲法
- Single (Investigator)
入排标准
- 年龄范围
- 6 Years 至 12 Years（Child）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Children aged 6 to 12 years
- •Refractive error of spherical equivalent -1.00 D to -6.00D in each eye as measured by cycloplegic autorefraction
- •Active myopia progression of at least spherical equivalent -0.50 D over the last 12 months as determined or suggested by refractive records or change in lens power
- •Astigmatism of less than or equal to -1.50 D as measured by non-cycloplegic or cycloplegic autorefraction
- •Distance vision correctable to logMAR 0.1 or better in both eyes
- •Normal intraocular pressure of not greater than 21 mmHg
- •Normal ocular health other than myopia
- •In good general health
- •Willing and able to comply with scheduled visits and other study procedures
排除标准
- •Baseline Anisometropia of > 1.5D
- •Ocular or systemic diseases which may affect vision or refractive error
- •Defective binocular function or stereopsis
- •Amblyopia or manifest strabismus including intermittent tropia
- •Previous or current use of atropine or pirenzepine
- •Any other conditions precluding adherence to the protocol including unwillingness to refrain from contact lens wear for the duration of the study
- •Allergy to cyclopentolate, proparacaine and benzalkonium chloride
结局指标
主要结局
Myopia progression as measured by spherical equivalent, and axial length
时间窗: 12 month
次要结局
未报告次要终点