Optical reduction of peripheral hyperopic defocus
Summary
Purpose
To discuss the effectiveness of optical reduction of peripheral hyperopic defocus in preventing progression of myopia.
Methods
The relationship between reducing peripheral hyperopic defocus and slowing progression of myopia has been discussed with regard to glasses, contact lenses, and orthokeratology. Previous studies on optical reduction of peripheral hyperopic defocus mainly in Japan will be presented. We performed a prospective, randomized, double-blind clinical trial using a questionnaire to compare myopic progression between a single-vision lens and a lens that reduces peripheral hyperopic defocus. This study is part of a multicenter trial in Japan and the results of our institute will be presented.
Results
Many clinical trials have suggested that reducing peripheral hyperopic defocus possibly retards progression of myopia. Outdoor activity is an evidence-based environmental factor that protects against myopia; our data also show the importance of outdoor activities for preventing progression of myopia.
Conclusion
Not only reducing peripheral hyperopic defocus but also environmental factors such as outdoor activity is important to retard myopia. A greater number of eyes should be evaluated in future studies.
