A small scale study by researchers said that. Wearing multifocal contact lenses reduces the rate of progression of myopia in children by 50%. The lengthening of the eye, a key measure of myopia, was also found to be reduced by an average of 29% when compared with the single-vision lens study. Although it is not entirely clear why the multifocal lenses had this effect, it is thought it may be due to the relative positive power at the periphery of the lens."The lens puts light at the front part of the retina and that acts as a signal to slow the growth of the eye".