IPA: //ˈpɜːrˌblaɪnd.nəs//
KK: /ˈpɜrˌblaɪndnəs/
The condition of being unable to see clearly or being partially blind.
His purblindness made it difficult for him to read the small print on the page.
Purblindness is formed from "pur-" (meaning thoroughly) and "blind" (from Old English "blinda", meaning unable to see) combined with the suffix "-ness" (meaning the state of). The term refers to the state of being thoroughly blind or having impaired vision.
Think of being 'thoroughly' ('pur-') unable to see ('blind') — that's what purblindness means.