Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
Inventor
active
Astigmatic self-refractor and method of use
Crossed cylinder lenses refractor and method of use
Crossed cylinder lenses refractor with three-lens variable cross
Devices for determining the crossed cylinder powers and axes for
Methods and apparatus for determining refractive error
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Profile ID: LFUS-PAI-P-752726