Instrument and method for use in optometric examinations
摘要
An optical instrument for use in conducting optometric examinations which generates an alphanumeric type display simulating the optical features of displays provided by video display terminals. The instrument comprises a light source and a multi-layered screen through which light from the source may be transmitted. The screen employs light from the source in forming characters which are comprised of pixel-like light elements similar to those making up VDT generated characters. Further, the screen is operative for degrading the image quality of the characters by transforming the light elements into Gaussian type spatial profiles typical of the pixels generated by VDTs.
申请公布号
US4998820(A)
申请公布日期
1991.03.12
申请号
US19880282596
申请日期
1988.12.12
申请人
APPLIED VISION CONCEPTS, INC.
发明人
SALIBELLO, COSMO;TORREY, JONATHAN G.;COFFMAN, STEVEN G.;MURCH, GERALD M.