Tod and Justin Purvis are brothers who are both slowly going blind. The two suffer from a rare degenerative eye disease known as Choroideremia. The disease begins during childhood, but usually leaves the sufferer blind sometime during adulthood. In 2010, they decided they wanted to see America before Choroideremia took their eyesight. Although they lived on different sides of the country, they teamed up for an epic road trip. Their journey took them 13,000 across America... And they documented the whole thing. Tod, 43, (left) and Justin, 38, (right) are both slowly losing their eyesight to Choroideremia, a degenerative disease...