Two brothers with a devastating degenerative eye disease completed a once-in-a-lifetime road trip across the USA to see the sights before they both turn blind. Justin Purvis, 38, and Tod Purvis, 43, suffer from Choroideremia, an inherited disorder which causes progressive loss of vision. Medics have warned the pair that the disease is likely to cause them to completely lose their sight. Scroll down for video . Tod (left) and Justin (right) in front of Devil's tower in Wyoming. The brother, who both have Choroideremia, completed a road trip across the USA to see the sights before they both turn blind . Both brothers currently experience tunnel vision. Tod still has half of his vision remaining, while Justin, who lives in New Jersey, has only 15 per cent of his sight left. Tod, of Los Angeles, said: 'When my vision first started to go in 2008, I got really down and depressed. 'I used to go to work and then come straight home and sit in my apartment - now I want to get out into the world and see things while I still can. 'Going on the trip with Justin brought me out of my apartment, seeing new things every day - it gave me a more positive attitude.' Tod tasting a piece of corn on a farm. The brothers set out on a 38-day-long journey across America to tick off items on their visual bucket list while they are still partially-sighted . Tod in the Nevada desert during the pair's 13,000-mile journey from New York to Los Angeles . Both brothers currently experience tunnel vision. Tod still has half of his vision remaining, while Justin, who lives in New Jersey, has only 15 per cent of his sight left. The disease affects their peripheral vision, night vision and depth and color perception. Tod, who works as a television editor, said: 'It's like looking down a long tunnel and you can see the light at the end, but the tunnel is coated in mirrors - it's like viewing the world through a static kaleidoscope. 'There are parts missing in your vision, so your brain tries to fill in the edges with the colors you can see.' The pair filmed their incredible journey across the USA in 2010. The film, called 'Driving Blind', was released this year and is available to rent on Vimeo and will soon be available on Amazon . Tod in the Nevada desert. He said he and his brother Justin were in search of the USA's most picturesque spots so they could cement the images in their minds forever . During the pair's journey from New York to Los Angeles they covered 13,000 miles, taking in landmarks such as the Grand Canyon in Arizona, Devil's Tower in Wyoming, Yellowstone National Park and Niagara Falls. They drove the length of the country in a Ford Escape. Tod is still capable of driving but Justin has already been declared legally blind. Tod said they were in search of the USA's most picturesque spots so they could cement the images in their minds forever. Justin (left) and Tod (right) meeting some snakes, as they tick off an item on their visual bucket list . He said: 'We wanted to see some places we had never seen, as well as re-visit some places we had been to before and loved - we wanted to cram as many visuals into our heads as we could. 'The one place that sticks in my mind is the Devil's Tower, which was used in Close Encounters of the Third Kind. It is such a surreal sight - we had never seen it before so we hung out there for a couple of hours just staring at it and taking it in.' Tod and Justin also went back to the Grand Canyon, which the pair had visited on a family vacation as children. Tod taking a photograph of the scenery. Choroideremia affects the brothers' peripheral vision, night vision and depth and color perception. The pair will eventually lose all of their sight . Justin (left) and Tod (right) at the Grand Canyon. The brothers were returning after they had visited the spot on a family vacation as children . He said: 'We appreciated it better seeing it this time - knowing we might never see it again.' Tod and Justin plan to keep travelling and visiting as many stunning locations as they can before they completely lose their vision. Tod said: 'I want to see everything - it's not just landmarks, it's museums and art galleries. It's not just America - we want to see the world. 'I'm planning on going to Alaska next year and me and my wife went to the Galapagos Islands recently.' Tod (left) and Justin (right) wild swimming in Pennsylvania. Both brothers hope to keep traveling . Tod (left) and Justin (right) sit down on the grass to take in some scenery. Most people suffering from Choroideremia will experience the most loss of vision during their late thirties . Most people suffering from Choroideremia will experience the most loss of vision during their late thirties, although the disease starts in early childhood. It affects approximately 1 in every 50,000 people and primarily occurs in males. Tod said: 'If I do lose my vision I will miss the sight of sunsets the most. 'I would miss seeing the faces of people I love, but I will still be able to hear their voices and that will help me to remember what they look like. Justin taking part in a wine tasting. The brothers drove the length of the US in a Ford Escape with Tod driving . Tod (left) and Justin (right) in a cave in South Dakota. The brothers say they want to see everything - not just the United States - and will continue their travels . 'But I would find it difficult knowing I'll never see my wife's face again.' The pair filmed their incredible journey across the USA in 2010. The film, called 'Driving Blind', was released this year and is available to rent on Vimeo and will soon be available on Amazon. 'We started filming under the impression that Tod and Justin had at least half of their eyesight left,' the filmmakers wrote on the documentary's website. 'It is revealed at the end that their eyesight was much much worse, and in truth the trip or film would have never happened had we knew they would in fact be driving blind. Justin was declared legally blind at the conclusion of the trip.' Justin looks at a sign pointing to Mount Rushmore. The brothers plan to keep travelling and visiting as many stunning locations as they can before they completely lose their vision . Justin (left) and Tod (right) in front of a camp fire in Pennsylvania during their epic trip across America .
Justin and Tod Purvis suffer from degenerative eye disease Choroideremia .
Brothers set out on 38-day-long journey  to complete their visual bucket list .
Included landmarks such as Grand Canyon, Devil's Tower and Niagara Falls .
Tod, 43, and Justin, 38, are both partially-sighted and have tunnel vision .
Two brothers with a devastating degenerative eye disease completed a once-in-a-lifetime road trip across the USA to see the sights before they both turn blind. Justin Purvis, 38, and Tod Purvis, 43, suffer from Choroideremia, an inherited disorder which causes progressive loss of vision. Medics have warned the pair that the disease is likely to cause them to completely lose their sight. Scroll down for video . Tod (left) and Justin (right) in front of Devil's tower in Wyoming. The brother, who both have Choroideremia, completed a road trip across the USA to see the sights before they both turn blind . Both brothers currently experience tunnel vision. Tod still has half of his vision remaining, while Justin, who lives in New Jersey, has only 15 per cent of his sight left. Tod, of Los Angeles, said: 'When my vision first started to go in 2008, I got really down and depressed. 'I used to go to work and then come straight home and sit in my apartment - now I want to get out into the world and see things while I still can. 'Going on the trip with Justin brought me out of my apartment, seeing new things every day - it gave me a more positive attitude.' Tod tasting a piece of corn on a farm. The brothers set out on a 38-day-long journey across America to tick off items on their visual bucket list while they are still partially-sighted . Tod in the Nevada desert during the pair's 13,000-mile journey from New York to Los Angeles . Both brothers currently experience tunnel vision. Tod still has half of his vision remaining, while Justin, who lives in New Jersey, has only 15 per cent of his sight left. The disease affects their peripheral vision, night vision and depth and color perception. Tod, who works as a television editor, said: 'It's like looking down a long tunnel and you can see the light at the end, but the tunnel is coated in mirrors - it's like viewing the world through a static kaleidoscope. 'There are parts missing in your vision, so your brain tries to fill in the edges with the colors you can see.' The pair filmed their incredible journey across the USA in 2010. The film, called 'Driving Blind', was released this year and is available to rent on Vimeo and will soon be available on Amazon . Tod in the Nevada desert. He said he and his brother Justin were in search of the USA's most picturesque spots so they could cement the images in their minds forever . During the pair's journey from New York to Los Angeles they covered 13,000 miles, taking in landmarks such as the Grand Canyon in Arizona, Devil's Tower in Wyoming, Yellowstone National Park and Niagara Falls. They drove the length of the country in a Ford Escape. Tod is still capable of driving but Justin has already been declared legally blind. Tod said they were in search of the USA's most picturesque spots so they could cement the images in their minds forever. Justin (left) and Tod (right) meeting some snakes, as they tick off an item on their visual bucket list . He said: 'We wanted to see some places we had never seen, as well as re-visit some places we had been to before and loved - we wanted to cram as many visuals into our heads as we could. 'The one place that sticks in my mind is the Devil's Tower, which was used in Close Encounters of the Third Kind. It is such a surreal sight - we had never seen it before so we hung out there for a couple of hours just staring at it and taking it in.' Tod and Justin also went back to the Grand Canyon, which the pair had visited on a family vacation as children. Tod taking a photograph of the scenery. Choroideremia affects the brothers' peripheral vision, night vision and depth and color perception. The pair will eventually lose all of their sight . Justin (left) and Tod (right) at the Grand Canyon. The brothers were returning after they had visited the spot on a family vacation as children . He said: 'We appreciated it better seeing it this time - knowing we might never see it again.' Tod and Justin plan to keep travelling and visiting as many stunning locations as they can before they completely lose their vision. Tod said: 'I want to see everything - it's not just landmarks, it's museums and art galleries. It's not just America - we want to see the world. 'I'm planning on going to Alaska next year and me and my wife went to the Galapagos Islands recently.' Tod (left) and Justin (right) wild swimming in Pennsylvania. Both brothers hope to keep traveling . Tod (left) and Justin (right) sit down on the grass to take in some scenery. Most people suffering from Choroideremia will experience the most loss of vision during their late thirties . Most people suffering from Choroideremia will experience the most loss of vision during their late thirties, although the disease starts in early childhood. It affects approximately 1 in every 50,000 people and primarily occurs in males. Tod said: 'If I do lose my vision I will miss the sight of sunsets the most. 'I would miss seeing the faces of people I love, but I will still be able to hear their voices and that will help me to remember what they look like. Justin taking part in a wine tasting. The brothers drove the length of the US in a Ford Escape with Tod driving . Tod (left) and Justin (right) in a cave in South Dakota. The brothers say they want to see everything - not just the United States - and will continue their travels . 'But I would find it difficult knowing I'll never see my wife's face again.' The pair filmed their incredible journey across the USA in 2010. The film, called 'Driving Blind', was released this year and is available to rent on Vimeo and will soon be available on Amazon. 'We started filming under the impression that Tod and Justin had at least half of their eyesight left,' the filmmakers wrote on the documentary's website. 'It is revealed at the end that their eyesight was much much worse, and in truth the trip or film would have never happened had we knew they would in fact be driving blind. Justin was declared legally blind at the conclusion of the trip.' Justin looks at a sign pointing to Mount Rushmore. The brothers plan to keep travelling and visiting as many stunning locations as they can before they completely lose their vision . Justin (left) and Tod (right) in front of a camp fire in Pennsylvania during their epic trip across America .
Two brothers with a devastating degenerative eye 43, suffer from Choroideremia, an inherited piece of corn on a farm. The brothers set out on a 38-day-long journey across America to tick off items on their visual bucket list while they are such as the Grand Canyon in Arizona, Devil's Niagara Falls. They drove the length of the their vision . Justin (left) and Tod (right) in