Mental? Yes.
Disorder? Sounds like a strong term.
How about "condition".
Disorder
Dyslexia .
No, that's ambidextrous. dyslexia is a reading disorder.
He has dyslexia.
no, its a neurological disorder.
Dislexia
dyslexia
dyscalculia the math version of dyslexia.
dyslexia
dyslexia?
dyslexia, and subsequently parkinsons.
He had dyslexia (read things backwards)