Subscribe to our channel to be the first to see our viral, breaking news videos. Twitter.com/swns Instagram.com/swns<br /><br />A desperate mum is in a race against time for cannabis to be legalised - because it can stop her son from going blind.<br /><br />Sam Clark, 14, was diagnosed with retinitis pigmentosa (RP) at just four years old, a rare genetic disorder which leads to blindness through gradual vision loss. <br /><br />Registered blind, the teenager can only see in the daylight and has severe tunnel vision which he compares to looking through two dark, thin straws.
