The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1992
Filed:
Sep. 19, 1989
Optometrics Limited, Dublin, IE;
Abstract
Apparatus for testing dark adaptation comprises a test panel. Four test stimuli, comprising arrays of light emitting diodes, are arranged on the test panel around a fixation light emitting diode. Translucent covers are mounted over the arrays of light emitting diodes. Four switches to enable a subject to input the identity of a visible test stimulus are provided, each switch is operated by a button formed by a respective cover of the test stimuli. A test stimulus is randomly selected and switched on at a predetermined level of luminance. On a correct identification, another test stimulus is selected and switched on at a reduced level of luminance. The times from the commencement of the test until the various correct identifications are recorded, as are the corresponding level of luminance of the test stimuli.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile