Invention Grant
US08967801B2 Self guided subjective refraction instruments and methods 有权
自我指导主观折射仪器和方法

Self guided subjective refraction instruments and methods
Abstract:
A refraction device determines a refraction end point to provide corrective optics for a test subject. The device includes an adjustable optical system providing corrective optics to the test subject and an adjustable viewing target disposed along an optical path such as to be viewable through the adjustable optical system by a test subject. The adjustable viewing target includes a directional indicator linked synchronously to at least two choices of corrective optics presented to the test subject.
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