Suppression and Balancing tests

The Suppression Test simply presents two letters or images side by side so that through the mask one image is seen by one eye and the second by the other eye - while the rest of the field is seen binocularly. This provides a quick way of checking for suppression.

However, the test can also be used for binocular balancing - the clarity of the two images is compared and the Rx offered to each eye is adjusted to obtain equality.

Letter Suppression test

The Letter Suppression test is selected by clicking on the corresponding icon on the Secondary Toolbar or by pressing 4 on the keyboard or remote.

Clicking on the O icon in the Secondary Toolbar or pressing O on the keyboard or remote causes the letter displayed to rotate around the 5 sets of default letters.  The letter shown is the first letter on the LogMAR row of the same size.

Clicking on the R icon in the Secondary Toolbar or pressing R on the keyboard or remote causes the letter displayed to be randomised.

Different optotypes can be displayed by selecting the required optotype from the pull-down list on the Secondary Toolbar or by pressing the vertical cursor control keys on the keyboard or remote.

The size of the letters displayed may be changed using the Vertical Scrollbar on the Floating Control Window or by pressing PgUp or PgDn on the keyboard or remote.

Picture Suppression test

The Picture Suppression test is selected by clicking on the corresponding icon on the Secondary Toolbar or by pressing 5 on the keyboard or remote.

This displays a series of images in the two windows in the mask.

The images may be changed using the Vertical Scrollbar in the Floating Control window or by pressing the Vertical Cursor Control keys on the keyboard or remote.