In its later stages the disease causes blindness.
Apart from his blindness, his health has worsened in general. (Certificate of Proficiency in English; C2; German)
My blindness to what was happening led me to make a bad decision.
His mother and Mister Hooper, with their blindness and insensitivity, do not see what is going on between the two boys. (Certificate of Proficiency in English; C2; French)