var vtn_player_type = "vp";var ven_video_key="NjAzNTA3fHwxNDcxfHwwfHx8fHx8";var ven_width="660";var ven_height="409";Police detain two people after at least 20 patients who had free cataract surgery at a camp in northern India are left blind. Duration: 00:47