By default, the Thomson Test Chart will display as many rows as will fit on the screen. However, it is sometimes useful to isolate one or two rows particularly when testing children.  The Thomson Test Chart is able to isolate 1 row with crowding, and 1 , 2, 3 or 4 rows without crowding bars as shown below:



Single row with crowding bars



One row without crowding bars



Two rows without crowding bars


Clicking on the L button on the toolbar or pressing L on the keyboard or mouse rotates through the following sequence:


    • One row with crowding bar
    • One row without crowding bar
    • Two rows without crowding bar
    • Three rows without crowding bar
    • Four rows without crowding bar
    • Full screen


Summary

Mouse

Select the corresponding button in the toolbar



Keyboard

Press L once to display a single row with crowding. Press L again to display 1,2,3 and 4 rows without crowding bars and once again to return to the full screen



Remote

Press L once to display a single row. Press L again to display 2,3 and 4 rows and once again to return to the full screen