This was highlighted in a recent BBC article , ‘What people see instead of darkness’. One individual, who lost his sight in childhood, says the world is an array of luminous colours and light, seeing swirls of light, spinning circles of colour as you might see in a kaleidoscope.
The article was a follow up to an article by a journalist who lost his sight in his youth and he says one of the things he misses most since losing his sight is darkness. Even although he has had the cord cut between his eyes and his brain, his world still has colour and lots of it, moving, swirling, changing colours.
Some who have been blind since birth describe seeing nothing, no colours, not even darkness. Like what you see out of the back of your head or as another person said it as “like trying to see out of one’s foot”, you literally don’t see a thing.
If you are fortunate enough to have your sight, make sure you look after it.