According to the query of 39 Health Network, the difference of myopia between the two eyes is 300 degrees, and defocused lenses can be used. Defocusing lens is designed to solve the defects of frame glasses. It can make the central vision image project on the retina, and through technical means, make the peripheral images project on or in front of the retina, thus preventing the eyes from adjusting themselves and increasing the axial length, thus achieving the purpose of preventing the development speed of myopia.
In a defocused lens, the central vision image will be projected on the retina, while the peripheral image will be projected on or in front of the retina. This design can prevent the eye from self-adjusting and increasing the axial length, thus slowing down the development of myopia.