LogMAR Chart

The logMAR chart is displayed by selecting the Logmar icon on the toolbar, pressing F1 on the keyboard of selecting LogMAR on the remote control handset.

The LogMAR chart has a number of advantages over the Snellen chart. For this reason it is recommended as the method of choice for measuring visual acuity.

Each row contains five letters (except for the larger sizes) and the letter size changes in steps of 0.1 logMAR between one row and the next.

The letter / optotype combination displayed by default can be changed via the LogMAR tab of the Options ... Chart Optotype Selection window as shown below. Pressing O on the secondary toolbar, keyboard or remote repeatedly will cycle through the five sets of default letters

Test Chart 2016 provides a wide range of options for customizing the LogMAR chart. These options may be selected using the Secondary toolbar or by using the keyboard or remote control.

The various options available in LogMAR mode are described under Test Charts - common features and include:

• Row labels
• Scrolling up and down
• Randomising letters
• Selecting different Optotypes
• Displaying a Single Column
• Displaying a Single Row
• Crowded / Uncrowded
• Duochrome split
• Coloured chart
• Low Contrast charts
• Pointing and underlining