Arrangement for making contactless section-like measurements of the form of curved optically effective surfaces

Claim 1

Arrangement for making contactless section-like measurements of the form of the cornea of the eye, the arrangement comprising: an apparatus for generating a plurality of light sections on the surface of the cornea, the apparatus having a main axis and including: slit means mounted on said axis and defining a slit; projection lens means mounted on said axis for projecting said slit onto said corneal surface; and, an imaging anamorphotic system for receiving an image of said light section at a predetermined angle with respect to said axis and for forming anamorphotic images of said light sections wherein the enlargement of said images is different in two directions running at right angles to each other; said system including a deflection element and cylinder lens means coacting therewith for imaging a point of said surface lying on said axis into an image point also on said axis; and, an optical detector arranged on said axis and receiving said anamorphotic images thereon for computing the total corneal surface from said light sections.