Oculus Optikgeraete Gmbh

Elfriede Aulhorn

Gert Koest

Josef Reiner

Jakob Kocher

Gert Kost

The invention relates to an apparatus and a method for finding blind spots in the eye of a person tested. In examinations carried out to date, it was necessary to scan the entire image field of the person tested. According to the invention an image with a plurality of image points lying closely side-by-side is offered to the person tested, the variations in the brightness of which image points are presented at a high frequency, and additionally, a fixation mark at a defined place. The apparatus and the method can be used in all types of examinations of the field of vision.

Apparatus and method for finding of scotomas in the eye of a person

1. The invention relates to an apparatus and a method for finding blind spots in the eye of a person tested. 2.1. In examinations carried out to date, it was necessary to scan the entire image field of the person tested. 2.2. According to the invention an image with a plurality of image points lying closely side-by-side is offered to the person tested, the variations in the brightness of which image points are presented at a high frequency, and additionally, a fixation mark at a defined place. 2.3. The apparatus and the method can be used in all types of examinations of the field of vision.

An apparatus for testing twilight vision and blinding sensitivity includes a housing having openings in opposite sides thereof, a person to be tested being able to look through the housing along a line of sight extending through both openings. A filter is provided for one of the openings to limit external light entering such opening. A concave mirror is arranged in the housing with its optical axis normal to the line of sight, and a semi-transparent mirror is arranged at the intersection of and at 45.degree. angles with respect to the line of sight and the mirror optical axis. A screen arranged at the focal point of the mirror is simultaneously illuminated by two projectors, a test figure being arranged in the beam of one projector and the light intensities of the two projectors being inversely proportionally controlled. Two filters are provided which can each be inserted in the beam of a respective one of the projectors to further reduce the light intensity. A headlight simulating source is arranged adjacent the field of vision on the screen and a third projector projects at least one fixation point onto the screen.

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Tuebingen, Germany

Elfriede Aulhorn