Enchroma offers its refurbished Enchroma Addison Sunglasses for the Color Blind in Black for $299 with free 2-day shipping. That's $50 less than you'd pay for a new pair. Designed for adults with symptoms of color blindness, these sunglasses purportedly improve visual detail and depth perception of colored objects. They're made in Italy and feature 100% UV protection, a TR-90 frame, embedded rubber nose pads, rubber inserts on inner temples, and hydrophobic coating.

Note: A 1-year Enchroma warranty applies. The item may have light scuffs or other minor blemishes.