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Device and method for accurately determining the rear vertex distance between the eye and the lenses in eyeglasses
专利权人:
Eric Fischer
发明人:
Eric Fischer
申请号:
US12430073
公开号:
US08857986B2
申请日:
2009.04.25
申请国别(地区):
US
年份:
2014
代理人:
摘要:
A measurement instrument and its associated method of use to record a pupil center position of a persons eye and determine rear vertex distance to a lens. The instrument has a chassis and a free swinging assembly that is pivotably attached to the chassis. The swinging assembly has alignment points that remain in a horizontal plane as the swinging assembly swings. The instrument is attached to a set of eyeglass that are worn on that persons head. A prism is suspended adjacent the eye. The pupil is viewed through the prism. The offset of the viewed image is measured and used to calculate the rear vertex distance.
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