feature substantial fenestration of initially flat thin plastic sheet material having the ability to not only self adapt and removably adhere to the surface of the cornea but also to retain and slowly release medication when thus adhered the embodiment of fig1 features circumferential continuity providing a succession of radially spaced concentric rings 11 12 13 14 15 about a central opening 10 these concentric rings are integrally connected by first sets of angularly spaced radial connections 16 16 39 between rings 11 12 and 13 14 and by further sets of such connectors 17 17 39 between rings 12 13 and 14 15 the sets 16 16 39 and 17 17 39 are in angularly staggered interlace the diameter of opening is desirably 6 to 8 mm for general conformance with iris diameter and therefore so as not to interfere with normal vision and the outer diameter of outer ring 15 may be 12 to 14 mm except for opening 10 in place of a lens the planiform of the haptic of fig1 will be recognized from my copending application ser no 467 436 filed feb 17 1983 to which reference is made as to self adaptation and other features in application to the surface curvature and moisture of the cornea the haptic configuration of fig2 will be recognized from my said u s pat no 4 377 329 again except for provision of a central circular opening 10 in place of a lens in the structure of.