Seven years' experience with acrylic anterior chamber lenses has proved the biological tolerance of the eye to methyl methacrylate, as demonstrated by some of my cases operated on since 1953, in which the lens is still perfectly tolerated.
However, endothelial dystrophy and bullous keratitis may sometimes be caused by friction with the edges of all methyl methacrylate lenses, particularly if the size is inaccurate. Research was undertaken to find a more suitable type of lens and technique.
After the various models of lenses made entirely of acrylic (Strampelli, Baron, Scharf, Schreck, Bietti, Apollonio, Barraquer, Salleras, Ridley, Boberg, and Choyce), the idea was conceived of making the central optic part of the lens of acrylic material and the external portion of flexible loops, so as to act as a spring (in Supramid * or other similar material), as first advocated by Dannheim and later adopted by Lieb and Guerry.
But even with
STRAMPELLI PB. Anterior Chamber LensesPresent Technique. Arch Ophthalmol. 1961;66(1):12-17. doi:10.1001/archopht.1961.00960010014005