Myopia control soft contact lens designs
How myopia control lens designs achieve this varies across designs, but they all essentially target the same profile of peripheral light rays being brought to focus in front of the retina. Most myopia control lens designs have been shown to provide a better myopia control effect than traditional soft center distance multifocal lenses.
How does specialty soft contact lenses slow near-sightedness?
Myopia control soft contact lenses are designed to slow the accelerated eye growth of childhood myopia based on how images are focused in the different parts of the retina.
Standard soft lenses
Standard single vision correction has been shown to cause peripheral light rays to focus behind the retina, which encourages eye growth and increased myopia.
Hyperopic defocus acts as a signal to grow the eyes.
Myopia Control Soft Lenses
Myopia control spectacles and contact lenses are designed to focus peripheral light rays in front of the retina, to act as a stop signal to encourage slower eye growth and slow progression of myopia.
Myopic defocus acts as a signal to stop the axial growth of young eyes.
Because contact lenses sit on the eye surface and move with the eye, they have a natural advantage over spectacles in being able to create this desirable peripheral focus profile, and they do this using some clever optical designs.