I once took an IQ test (complicated reasons) that contained a visual acuity/processing test. My visual processing skills came in at the third percentile. 97% of the population has more brain ability to draw/"see" than me.

Strangely enough, I'm not blind or anything, I just tend to miss a few subtle facial cues or miss the paper I left on the desk, things like that. And I can't really draw worth a damn without employing a whole lot of technical practice.