Glasses to treat color blindness...

Glasses to treat color blindness...  For real!  But only certain kinds of color blindness, albeit the most common ones.  These glasses work by blocking particular light frequencies – those sensed by both red and green “cones” (the color-sensitive photo-sensing cells on your retina).  By blocking the common sensitivity, the glasses improve the eye's ability to discriminate between colors.  My favorite part: the effectiveness of these glasses was discovered entirely by accident!