Inventor

Randy H. Kardon

Document Type

Patent

Patent Number

US Patent 5,490,098

Patent agency

United States Patent and Trademark Office

Publication Date

2-6-1996

Assignee

University of Iowa Research Foundation (Oakdale, IA, US)

Application Number

08/194,409

Date Filed

1994-02-10

Total Pages

7 pages

Abstract

An automated system and method for determining pupillary threshold response is described. The system achieves the determination of pupillary threshold levels through the measurement of supra-threshold responses at varying light intensities, which measured values are processed by a non-linear regression routine to approximate threshold response. The system takes supra-threshold measurements by means of a computerized pupillometer which is linked to an automated perimeter. The measurements are sequentially taken at varied light intensities which are reiteratively selected in response to the comparison between responses that have been previously measured during the test and a pre-stored response curve of expected values. The measured values are then processed by a non-linear regression routine to indirectly generate an estimated threshold level. The system is fully automated, produces accurate and reliable results, and is not subject to the uncertainties which are attendant with the measurement of threshold levels by the taking of subjective measurements.

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URL

https://ir.uiowa.edu/patents/145