Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
June 24, 2008
Patent Application Number
11402260
Date Filed
April 12, 2006
Patent Citations Received
Patent Primary Examiner
Patent abstract
According to an aspect of the present invention, there is provided a measurement apparatus for measuring a property of an eye of a subject, having a target arranged to be viewed by the subject, the target including a first light and a second light arranged to undergo a modulation in anti-phase, the modulation decreasing from an initial modulation frequency at which an initial flicker of the first light and second light is not perceivable by the subject; and an indication device allowing the subject to indicate when a flicker is perceived, the modulation frequency at which the subject indicates that the flicker is perceived being defined as a threshold modulation frequency.
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