Joseph Kevin WHITE,Brian EVERETT,Michael SWINEY,John CHURCH,James STEPHENSON
申请号：
US16578922
公开号：
US20200015673A1
申请日:
2019.09.23
申请国别(地区):
US
年份:
2020
代理人:
摘要：
A vision testing apparatus has a frame including a face plate with at least one eye shield having a viewing slot positioned in a viewing direction perpendicular to the face plate, at least one variable lens element including an outer rail and multiple regions of varying diopter power having a width that is equal to or greater than the width of the viewing slot of the eye shield, and adjustable controls for moving the variable lens element in a direction perpendicularly to the viewing direction along a plane of the face plate. The testing apparatus is portable and can be used in developing nations where visual acuity is not corrected because of lack of access to optometric care.
