Effect of bifocal and prismatic bifocal spectacles on myopia progression in children: three-year results of a randomized clinical trial.

Bifocal spectacles can slow myopia progression in children with an annual progression rate of at least 0.50 D after 3 years. These results suggest that prismatic bifocals are more effective for myopic children with low lags of accommodation. TRIAL REGISTRATION clinicaltrials.gov Identifier: NCT00787579.