Patent · US Active

Method for performing a contrast vision test

US7771052B2 · kind B2 · utility

11Cited by

4References

20Claims

0Family size

Assignee

Carl Zeiss Vision GmbH · DE

Inventors

Timo Kratzer · Aalen, DE
Erich Hofmann · Aalen, DE
Lars Mendel · Aalen, DE

Key dates

Filing date	Sep 10, 2005
Grant date	Aug 10, 2010
Priority date	—
Expiry date	Aug 16, 2026

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61B3/06
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

The invention relates to a method for performing a contrast vision test on a subject in order to determine a contrast sensitivity function. According to said method, an image of a continuous sinusoidal grid is presented to the subject for viewing, the spatial frequency continuously changes in the direction of a first axis, and the contrast continuously changes in the direction of a second axis that extends perpendicular to the first axis. The subject's contrast sensitivity function is defined by means of a curve that encloses an area of the sinusoidal grid in which the subject perceives the sinusoidal grid pattern during viewing.

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