Get access

Full correction and Undercorrection of Myopia Evaluation Trial: design and baseline data of a randomized, controlled, double-blind trial

Authors


  • Conflict/competing interest: No stated conflict of interest.
  • Funding sources: This study was supported by grants from the Major State Basic Research Development Program of China (‘973’ Program, 2011CB504601) of the Ministry of Science and Technology, from the Major International (Regional) Joint Research Project (81120108807) of the National Natural Science Foundation of China, from China Postdoctoral Science Foundation (20110490247) and Research Foundation of Beijing Tongren Hospital Affiliated to Capital Medical University (2012-YJJ-019).

Correspondence: Professor Ning-Li Wang, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China. Email: wningli@vip.163.com

Abstract

Background

To determine the difference in the rate of myopic progression between children wearing single vision lenses with undercorrection of +0.50 D and children whose myopia is fully corrected, and to explore the factors that may influence the process.

Design

Randomized, controlled, double-blind trial.

Participants

Two hundred children aged 7–15 years with low-to-moderate myopia (−1.5 D to −6.0 D), astigmatism <−1.5 D and anisometropia <1.0 D.

Methods

The children were randomly allocated to wear single vision lenses with full correction or undercorrection by +0.50 D. Ocular examinations and questionnaire surveys for myopia-related factors will be performed every 6 months.

Main Outcome Measures

Cycloplegic autorefraction and axial length.

Results

Of 200 children, 100 (50%) were girls, 41 (21%) esophoric and 82 (42%) exophoric at near. The characteristics of gender, age, age of myopia onset, phoria, eye dominance, parental myopia, refractive error, axial length, corneal curvature, mean time spent in near work and outdoor activities between the two groups were not significantly different. The accommodative responses at 33 cm, the accommodative demands and lags at infinity were significantly different in the two groups as they were measured with full correction in one group and undercorrection in the other.

Conclusion

Full correction and Undercorrection of Myopia Evaluation Trial is a clinical trial designed to determine the effectiveness of undercorrection of myopia by +0.5 D on myopic progression in a population of school-aged children known to be susceptible to myopia and to identify the factors influencing the process.

Ancillary