Device and method for vision test
AssigneeVisumetrics AB
InventorLars Frisén
Life of this patent
Estimating the term…
Abstract
A device for vision testing comprises a viewing position (6) and an image surface (5). The distance between the viewing position (6) and the image surface (5) is enclosed. The relation between the resolution of the image surface and the distance between the viewing position (6) and the image surface (5) is such that the angle of a point on the image surface (5) is less than or equal to 1 minute of arc seen from the viewing position (6).
Claims18
A device for vision testing, comprising a viewing position and an image surface, the distance between the viewing position and the image surface being enclosed, wherein the ratio of the resolution of the image surface to the distance between the viewing position and the image surface is such that the angle of a point on the image surface is less than or equal to 1 minute of arc seen from the viewing position.
A method for vision testing, comprising the steps of arranging a viewing position and arranging an image surface at a distance from one another so that the relation between the resolution of the image surface and the distance is such that the angle of a point on the image surface is less than or equal to 1 minute of arc seen from the viewing position;
- connecting a computer to the image surface and, by means of the computer, generating illumination of at least one point on the image surface;
- and
- after a period of time, turning off said at least one point on the image surface.
Dependencies are inferred from the claim text.