... E, Landolt C, Red-green Blindness, Contrast sensitivity, Red / Green, Worth For Dot, Minute Stereo, Schober, Cross, Fixation, Cross grid, Beehive, Astigmatic ... customer the best that we can.We will refund you for items returned within 7 days of you receiving them ... damaged or missing components is not refundable.Buyers are responsible for return shipping with proper packaging.On receiving items, we will ...