White letters on a black background can be easier to see for the eyes.  

Includes:
Full size  professionally printed 11x23 inch black and white eye chart (black background, white letters)

Matching mini eye chart in black and white (business card size)
 
Includes instructions.
 
TWO WEEKS SHIPPING TIME (this may be faster once the initial run is received)
 
Returns permitted within seven days of unused items in original packaging, buyer pays return shipping.