One night, Tomás realised something was seriously wrong. He went for a stroll, along the same paths near his village that he had walked along countless times with his friends, their cheerful voices echoing in the still of the night.
There were no streetlights, and the paths were illuminated solely by moonlight. This had never been a problem before, but all of a sudden Tomás realised that he couldn’t clearly make out the edges of the path. He stopped, hesitated, and tried to find a reference point, but the edges of his vision blurred. Without realising it, Tomás had just experienced the first symptom of retinitis pigmentosa: the loss of vision in low light, also known as “night blindness”.
