Suction ring for surgical operations on the human eye

A suction ring apparatus for use in surgical eye operations comprising a right-angle section annular outer ring which retains an annular ring member of substantially triangular cross-section including an outer cylindrical wall surface, an annular end face surface and an eye-containing surface; the annular inner member has formed on its outer cylindrical wall surfaces and on the annular end face perpendicular thereto consecutive angularly spaced-apart discrete segments which engage an inner cylindrical wall surface and an annular inside end face surface of the outer ring and bound between the same and the inner member channels communicating with one another and with a vacuum bore associated with the outer ring which is connectable to a vacuum source; an edge of the outer ring defining a central aperture of the outer ring is dimensioned so that its diameter corresponds to the diameter of the corneal limbus and rests thereupon in operation. With such a construction, distortion of the eye is avoided and the apparatus can be non-movably disposed exactly in the limbus plane without contacting the cornea such that a trepan attached to the apparatus always moves within the optical axis.