Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
183 words
In an apparatus for testing twilight vision and blinding sensitivity, including a screen which is illuminated simultaneously by first and second projectors, a test figure being arranged in the beam of the first projector and including means for controlling the light intensity from both projectors with respect to one another so that the light intensity from the first projector increases in the same degree as the light intensity from the second projector is decreased and vice versa, and including a headlight source arranged next to the field of vision on the screen, the improvement comprising wherein the screen is arranged at the focal point of a concave mirror, wherein between the concave mirror and the screen there is arranged a semi-transparent mirror which is inclined with respect to the optical axis of the concave mirror, which semi-transparent mirror is opposite the eyes of the tested person, wherein the apparatus has an opening along the line of sight of the tested person which permits an unhindered looking out, and wherein the opening is provided with a filter for reducing the light entering from outside.
Claim 2
Dependent Claim
183 words
In an apparatus for testing twilight vision and blinding sensitivity, including a screen which is illuminated simultaneously by first and second projectors, a test figure being arranged in the beam of the first projector and including means for controlling the light intensity from both projectors with respect to one another so that the light intensity from the first projector increases in the same degree as the light intensity from the second projector is decreased and vice versa, and including a headlight source arranged next to the field of vision on the screen, the improvement comprising wherein the screen is arranged at the focal point of a concave mirror, wherein between the concave mirror and the screen there is arranged a semi-transparent mirror which is inclined with respect to the optical axis of the concave mirror, which semi-transparent mirror is opposite the eyes of the tested person, wherein the apparatus has an opening along the line of sight of the tested person which permits an unhindered looking out, and wherein the opening is provided with a filter for reducing the light entering from outside.
Claim 3
Dependent Claim
35 words
The apparatus according to claim 1, including at least one fixation point which lies next to the image of the test figure on the screen and is projected onto the screen by a further projector.
Claim 4
Dependent Claim
31 words
The apparatus according to claim 1 or claim 2, including two further filters which can each be arranged in the beam of a respective one of the first and second projectors.
Claim 5
Dependent Claim
54 words
The apparatus of claim 3, including a pair of rotationally supported disks and a plurality of said further filters supported at peripherally spaced locations on each said disk, rotation of each said disk effecting successive alignment of said filters supported thereon in the beam of a respective one of said first and second projectors.
Claim 6
Dependent Claim
29 words
The apparatus of claim 2, wherein each said projector includes at least one mirror which deflects the beam of light from the lamp of the projector toward said screen.
Claim 7
Dependent Claim
58 words
The apparatus of claim 2, wherein each said projector includes two mirrors, the beam of light from the lamp of each projector traveling in a first direction to one said mirror, being deflected by said one mirror and traveling in a second direction to a second said mirror, and being deflected by said second mirror toward said screen.