Göran Anders JOHANSSON,Matthew J. Everett,Christopher J.R.V. Baker
申请号：
US13422935
公开号：
US20130070204A1
申请日:
2012.03.16
申请国别(地区):
US
年份:
2013
代理人:
摘要：
Systems and methods for providing variable refractive correction in a visual field testing device are presented. One embodiment of the variable refractive correction involves two or more aligned transmissive plates arranged to produce changes in refractive power by translation or rotation of the plates relative to each other. Several alternative designs for providing variable refractive correction are described. The refractive correction can be set manually or automatically based on knowledge of the refractive error of a specific patient and spherical and cylindrical refractive correction are possible. Additional lens systems can be used to extend the range of refractive correction to accommodate a larger patient population.
