Patent · US Active

Systems and methods for refractive correction in visual field testing

US8668338B2 · kind B2 · utility

7Cited by

27References

22Claims

0Family size

Assignee

Carl Zeiss Meditec AG · DE

Inventors

Göran Anders Johansson · Tyresö, SE
Matthew J. Everett · Livermore, US
Christopher Baker · Moraga, US

Key dates

Filing date	Mar 16, 2012
Grant date	Mar 11, 2014
Priority date	—
Expiry date	Apr 7, 2032

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61B3/0285
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

Systems and methods for providing variable refractive correction in a visual field testing device are presented. One embodiment of the variable refractive correction involves two or more aligned transmissive plates arranged to produce changes in refractive power by translation or rotation of the plates relative to each other. Several alternative designs for providing variable refractive correction are described. The refractive correction can be set manually or automatically based on knowledge of the refractive error of a specific patient and spherical and cylindrical refractive correction are possible. Additional lens systems can be used to extend the range of refractive correction to accommodate a larger patient population.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.