Near Fixation Disparity Tests

The horizontal and vertical fixation disparity tests are displayed by selecting the corresponding button in the Secondary toolbar or by pressing 1 and 2 respectively on the keyboard or remote.

The patient views the screen binocularly through the red and green filters. The entire field except for the two monocular markers, is seen binocularly. The patient is asked to look at the cross in the centre and report if the markers above and below the cross are in a straight line. If they are mis-aligned, appropriate prisms or lenses are used to align them in the normal manner.

NOTE: Research has shown that results obtained using this test correlate very well with conventional tests of fixation disparity.