Contact glass for ophthalmologic surgery
A contact glass for ophthalmic surgery, including a concave anterior lens surface for placement on the eye and a suction channel annularly surrounding the periphery of the anterior lens surface. The suction channel allows the contact glass to be fixed to the eye by means of a vacuum, it is envisaged that the suction channel comprise a multiplicity of suction orifices, which are annularly arranged with respect to the anterior lens surface and through which the vacuum acts on the eye.
1. An adapter contact lens to be applied in contact with an anterior corneal surface of a cornea of an eye, the adapter comprising:
a contact glass portion having an anterior lens surface, adapted for placement in contact with the eye; and
a mount portion circumferentially surrounding the contact glass portion, the mount portion presenting a plurality of suction orifices annularly surrounding the anterior lens surface of the contact glass portion, wherein the mount portion and the plurality of suction orifices are shaped and adapted to apply suction to the surface of the eye through the suction orifices;
the mount portion further comprising a suction channel, which annularly surrounds the periphery of the anterior lens surface and in which the suction orifices terminate;
wherein the suction channel is an annular space between and partially bounded by the mount portion and the contact glass portion, the annular space being further bounded by a wall of the mount portion extending from an exteriorly located edge of the mount portion to the edge of the anterior lens surface, and the wall of the mount further defining openings therethrough that form individual channels and, thus, the suction orifices.
2. The adapter contact lens as claimed in claim 1 , wherein the anterior lens surface defines a concave curvature and the suction orifices are located on a curved annular surface.
3. The adapter contact lens as claimed in claim 1 , wherein the anterior lens surface defines a concave curvature and the suction orifices are located on a curved annular surface.
4. The adapter contact lens as claimed in claim 1 , wherein the suction orifices are round, oval or rectangular.
5. The adapter contact lens as claimed in claim 1 , further comprising a coding element encoding a geometric or optical parameter of the contact glass.
6. The adapter contact lens as claimed in claim 5 , wherein the coding element encodes a diameter of the anterior lens surface.
7. The adapter contact lens as claimed in claim 5 , wherein the coding element comprises color coding.
8. The adapter contact lens as claimed in claim 1 , further comprising an optical coupling to couple illumination radiation into the region of the annularly arranged suction orifices.
9. The adapter contact lens as claimed in claim 1 , wherein the anterior lens surface is aspheric.
10. The adapter contact lens as claimed in claim 1 , wherein the structure of the adapter contact lens is such that no vacuum is applied between an anterior surface of the contact glass portion and the eye when vacuum is applied to the mount portion.
11. The adapter contact lens as claimed in claim 1 , wherein the suction orifices are provided such that, when the eye fully contacts an anterior surface of the lens body, the suction orifices are not covered by the cornea of the eye so that suction is not effected.
12. The adapter contact lens as claimed in claim 1 , wherein the suction orifices are located in an anterior concave surface portion of the mount and wherein a curvature of the anterior concave surface portion is less than a standard curvature of the cornea of the human eye.
13. The adapter contact lens as claimed in claim 1 , wherein an axially forward contour of the mount does not protrude with respect to a standard curvature of the cornea of the eye.