Vision tests using the Binoptometer® 4P can be performed at different distances. This is helpful for example when carrying out VDU (visual display unit) workplace investigations. If the examinee is wearing multifocal or progressive glasses during the investigation, he will use different portions of his glasses for different testing distances in order to achieve the best possible visual acuity. The adjustable viewing angle of the Binoptometer® 4P allows the test field to be positioned in such a way that the examinee will not go beyond his habitual eye movement patterns in order to see the optotypes through the appropriate portion of his glasses. This enables him to maintain a comfortable sitting posture and head carriage throughout the test.
We recommend that the viewing angle be adjusted for the best possible visual acuity by the examinee herself. This will allow the examiner to judge the suitability of her current spectacles for certain visual tasks. For example, if she sets the viewing angle within the range of 30° to 35° for mid-distance visual tasks (50 to 60 cm testing distance), it can be assumed that her current near-vision prescription (normally determined at 30 to 40 cm) is no longer sufficient. The selected viewing angle is recorded by the Binoptometer® 4P software for each test step so that it can be looked up at a later time.
