LEA Numbers Low Contrast Flip Chart | 270400
$114.00
The contrast levels of the test lines on five pages are: 25%, 10%, 5%, 2.5% and 1.2%. The LEA Numbers are the 9.5M size at 1 meter corresponds to visual acuity 20/200 (6/60, 0.1), at 2 meters to 20/100 (6/30. 0.2) at 4 meters 20/50 (6/15, 0.3. There is one line of Numbers at each contrast level per card. All cards are bound in a spiral flip chart for ease of presentation.