公开(公告)号：US06739722B2

公开(公告)日：2004-05-25

申请号：US10234592

申请日：2002-09-04

申请人： Stephen W. Laguette ,  Alan J. Lang ,  Alan Schier ,  Joseph Warren Asa

发明人： Stephen W. Laguette ,  Alan J. Lang ,  Alan Schier ,  Joseph Warren Asa

IPC分类号： A61B302

CPC分类号： A61B3/09 ,  A61B3/103

摘要： Apparatus for measuring accommodation of a lens in an eye includes a target, a Badal lens, and a viewing aperture, where the Badal lens and the viewing aperture are positioned so that when the target moves towards or away from the lens, the apparent size of the target remains constant to a subject looking in the viewing aperture regardless of the distance the target moves. The apparatus may be provided in a compact housing and may include a mirror placed in the housing so that the viewing aperture can be placed away from the optical axis of the lens. The apparatus includes a controller to control the movement of the target. The apparatus measures the accommodation of a lens based on the distance the target moves during an examination. Methods of measuring accommodation of a lens in an eye of a subject are also disclosed.