Left-handers are likely to have some language problems as stutter and dyslexia which means, reading ability and copin with written symbols is substantially worse than would be expected from their level of intelligence and their performance in non-reading tests.
Dyslexia may vary from a very minor disadvantage to an almost total inability to read.

Symptoms
There seems to be difficulty in visual perception and discrimination. Letters and words are perceived as reversed, so that ‘d’ becomes ‘b’ and ‘was’ becomes ‘saw’. Complete mirror writing may occur.