The rapper, real name Allan Pineda Lindo, has confirmed he suffers from a rare genetic eye disorder nystagmus.
His blurry vision and bad nearsightedness causes him to squint and strain to see objects.
It also causes his eyeballs to vibrate involuntarily.
According to British newspaper The Sun, the 36-year-old said: 'I'm good at shapes.
'If I am not close, even if it's big, I can't read it.'
Apl.de.ap admitted that suffering from the condition when he was younger encouraged him to be more interested in music.
He added: 'Until I discovered hip hop, I felt I was not going to accomplish anything.
'When I dance, I picture myself and the floor in my head.
'I doubted myself for a long time, I'm comfortable not using my vision. I weave around my problems.'