Myopia prevention and control spectacle lens
Disclosed is a myopia prevention and control spectacle lens, including a lens body, wherein the lens body is provided with four regions including a first region for providing refractive power, a second region for inhibiting myopia development, and a third region and a fourth region for providing a progressive diopter variation. The first region has a function of focusing an image on a retina of an eye while correcting a refractive error. The second region has a function of restricting image focusing. The third region has a function of expanding a visual field. For distant vision identification, an image of an object is formed through the first region while imaging in front of or behind the retina is restricted through the second region. For near vision, through the third region, the vision is clearer, and the development of a refractive error of an eyeball can be inhibited or slowed down.
1 . A myopia prevention and control spectacle lens, comprising a lens body ( 110 ), wherein the lens body ( 110 ) is provided with four regions, the four regions comprising a first region ( 111 ) for providing refractive power, a second region ( 112 ) for inhibiting myopia development, and a third region ( 113 ) and a fourth region ( 114 ) for providing a progressive diopter variation;
wherein the second region ( 112 ) is provided with several pits ( 120 ) arranged dispersedly as an out-of-focus region, and the second region ( 112 ) is disposed on a front surface of the lens body ( 110 );
wherein the third region ( 113 ) is configured as a near vision region, the third region ( 113 ) is configured as a refractive region with a progressive diopter variation, and the third region ( 113 ) is disposed on a front surface or a rear surface of the lens body ( 110 );
wherein a diameter of the first region ( 111 ) ranges from 5.5 mm to 20 mm, and a shape of the first region ( 111 ) is configured to be a circular shape, a shell shape, a triangular shape, a square shape, or a regularly hexagonal shape;
wherein a diameter of each of the pits ( 120 ) in the second region ( 112 ) ranges from 0.1 mm to 2.4 mm, and a spacing between adjacent ones of the pits ( 120 ) in the second region ( 112 ) is 0.3-2.8 mm;
wherein the third region ( 113 ) and the fourth region ( 114 ) are located at a periphery of the first region ( 111 ) and the second region ( 112 ).
2 . The myopia prevention and control spectacle lens of claim 1 , wherein the first region ( 111 ) is configured as a centrosymmetric refractive region of the lens body ( 110 ), and the first region ( 111 ) is disposed on a front surface or a rear surface of the lens body ( 110 ).
3 . The myopia prevention and control spectacle lens of claim 1 , wherein the second region ( 112 ) is configured to half-surround the first region ( 111 ), and a shape of the second region ( 112 ) is configured to be an incomplete circular shape, a square shape, or a regularly hexagonal shape, etc.
4 . The myopia prevention and control spectacle lens of claim 1 , wherein an additional diopter range of the third region ( 113 ) is configured to be +0.25 to +4.00.
5 . The myopia prevention and control spectacle lens of claim 1 , wherein the fourth region ( 114 ) is an edge region of the lens body ( 110 ).