title: Engineering analysis of the J-loop posterior chamber lens.
abstract: A detailed mathematical analysis of the stresses and strains occurring during and after horizontal or vertical implantation of a J-loop posterior chamber lens showed that vertically implanted lenses are almost twice as resistant to gravitational forces than are horizontal implants, and that gravitational "sag" for either lens position is less than 0.02 mm. Similar analyses using the Simcoe-style posterior chamber lens showed that this lens requires a greater loop fiber diameter than does the more rigid J-loop lens.
mesh_terms: D004738:Engineering; D006801:Humans; D007910:Lenses, Intraocular / Q000592:standards*; D008433:Mathematics; D013314:Stress, Mechanical