There is no essential difference between annular focusing and defocusing lens. Both annular focusing and total focusing are evolved from defocusing lenses. Ring-focus lenses are thinner and lighter, which reduces the pressure on the bridge of the nose. Compared with lenses with the same refractive index and the same diameter, ring focal lenses are light and thin. The field of view of circular focal lens is wider than that of ordinary aspheric lens; The peripheral image of the defocused lens is imaged behind the retina. Although a clear imaging signal of the object is obtained, a stimulus signal with visual defects will be sent out in the peripheral retina, which will lengthen the eyeball, make the retina grow backward, and lead to the elongation of the eye axis.

Extended data:

Scientists suggest that when myopic children are corrected with monocular lenses, the central vision image is projected on the retina, but its periphery is projected behind the retina. Causes the axial length to become longer and the degree of myopia to increase.

Myopia is that the image of distant objects focuses in front of the retina, resulting in blurred vision, mostly caused by the elongation of the eye axis. In the past four years, on average, more than 654.38 million parents chose to wear Zeiss growth lenses for their children every year. Using peripheral vision control technology, this innovative lens slows down the development of myopia in children by 30% on average.

Zeiss Changle lens adopts "peripheral vision control" technology, so that the central part of the image is projected on the retina, and the peripheral part is projected on the front (or above) of the retina, which can effectively inhibit the axial length of children and delay the development of myopia. Children aged 5- 12 can wear it, and it works best at this age.