Introduction

In recent years, the phenomenon of visual degradation is very common.The existing means of treatment is to adjust the focal plane by irreversible means to restore vision. This approach in many cases can not meet the needs of users.Especially those who contain myopia and presbyopia, they usually need to remove their glasses or replace their glasses.If there is a kind of glasses can be autofocus then you can solve the above problems. Whether users look at the distance, or look near, glasses can automatically adjust the lens, adjust the most appropriate focal length.