公开(公告)号：EP0597994A4

公开(公告)日：1994-09-14

申请号：EP92917157

申请日：1992-08-07

申请人： CAPRICORNIA CONTACT LENS

发明人： NEWMAN STEVE

IPC分类号： G02C7/04

CPC分类号： G02C7/041 ,  G02C7/048 ,  G02C2202/02 ,  G02C2202/20

摘要： A toric lens for axis mislocation correction having optical topography on the surface/s of the lens which induces a depth of field effect on the eye and enables the axis of powers on the lens to align with those on the eye of the wearer such that it neutralises mislocation error if the lens mislocates 1 degree or more. The lens is thin enough to allow sufficient oxygen transmission therethrough to provide satisfactory morphology of the eye of a wearer. The optical topography which induces the depth of field effect comprises either aspheric topography, spline curve functions, diffractive optics using eschelets or bi-refringence optics.