1. The intrastromal corneal device for changing the shape of the curvature of the cornea, intended for surgical implantation into the human cornea between its layers and configured to change the curvature of the cornea for treating corneal ectasia, characterized in that the device comprises an annular structure having a convex surface, the aforementioned convex the surface contains at least one opening for biological exchange between the layers of the cornea, and the aforementioned ring structure has the shape of a ring the central segment or a spherical or aspherical shape, the diameter of the circumscribed circle of which lies in the range from 2.0 mm to 13.0 mm； the cross section of the said device has a variable radius of curvature of 4.5 mm to 17.0 mm. 2. An intrastromal corneal device according to claim 1, characterized in that said substantially annular structure comprises at least one opening on its surface. An intrastromal device according to claim 1, characterized in that it contains a material whose elastic modulus exceeds the elastic modulus of the human cornea. Intrastromal device according to paragraphs. 1 and 3, characterized in that it contains a material whose elastic modulus lies in the range from 0.6 to 8500 megapascals. 5. Intrastromal corneal device according to paragraphs. 1 and 3, characterized in that it can be made of polymers or copolymers of methyl methacrylate. 6. Intrastromal corneal device according to paragraphs. 1 and 3, characterized in that it can be made of biocompatible metal materials such as platinum, titanium. 7. The intrastromal device according to claim 1, characterized in that it contains, according to1. Интрастромальное корнеальное устройство для изменения формы кривизны роговицы, предназначенное для имплантации хирургическим путем в роговицу человека между ее слоями и выполнено с возможностью изменения кривизны роговицы для лечения эктазий роговицы, отличающееся тем, что устройство содержит кольцевую конструкцию, имеющую в
