publication_number US 4526171 A abstract this invention relates to correcting vision defects and more particularly to changing the curvature of the human cornea by the formation of incisions on the surface of the cornea application_number US 11232880 A description referring generally to the drawings and in particular to fig1 there is depicted a cornea incision device in accordance with the invention generally referred to by reference numeral 10 also depicted in fig1 is a side elevational view of part of a human eye 12 that includes a sclera 14 and a cornea 16 suction ring 18 concentrically surrounds cornea 16 and abuts sclera 14 as shown in fig1 suction ring 18 abuts sclera 14 along the inner circumference of suction ring 18 and along the terminal portion of downwardly extending flange 19 of suction ring 18 to form a sealed volume 20 bounded by suction ring 18 and that portion of sclera 14 covered by suction ring 18 an air passageway 22 communicates with sealed volume 20 to allow application of a vacuum to sealed volume 20 by application of a vacuum to sealed volume 20 the observed and relative intraocular pressure of eye 12 will increase the tension of cornea 16 facilitating formation of the incisions and restricting movement of eye 12 with respect to suction ring 18 depending on the desired location of the surface incisions the.