Jeffrey P. Krall,Hugh McLoughlin,Trevor Steele,Andrew Whale
申请号：
US13214615
公开号：
US08287124B2
申请日:
2011.08.22
申请国别(地区):
US
年份:
2012
代理人:
摘要：
The invention generally relates to a lens and the method of manufacturing progressive addition lenses (PAL) to remove unwanted base out prism and minimize excessive convergence, comprising determining basic configuration of two major lens surfaces to provide a distance portion and near portion, wherein diopter power increases from the distance portion of the lens to the near portion selecting an amount of prism reduction and reducing base out prism that inherently occurs as diopter power increases by altering the configuration of the lens as a function of the amount of prism reduction to minimize any disruption of optical properties a lens while decreasing base out prism.
