A 10-year-old boy has gone viral after his family uploaded a video of him seeing colours for the first time.
Cayson Irlbeck from Johnston, Iowa has been colour blind since birth and has been given a "second chance of life" with a new pair of glasses.
The EnChroma glasses have a 50/50 chance of working and use an optical filter that removes certain wavelengths of light and allows colourblind people to better perceive colour.
“It was instant. I knew right away something had changed (and) how bright everything was," Cayson told KKCI News.
"It was so colourful. It was weird (because) I had never seen those colours before, but I kind of knew what they were. I don't know. It was just awesome.
"That day changed my life."
Cayson's dad, Aaron Irlbeck, said it was "very emotional".
"Just to be able to see all of a sudden a whole new world opened up for him, obviously it was very emotional."