I was putting up some wall decorations earlier today and was painstakingly realigning everything until it looked level to my eyes. It might be just a hair off, but if I don’t correct it, I’ll see the misalignment almost instantly and get bothered for the rest of time until I fix it. Has anyone investigated, or is there literature on the minimum perceptible angle from level to the naked eye?
I don’t know too much about this area, but I do know that this kind of task involves a bunch of complex processing in the brain. The more “Mechanical” aspects of vision could be described as visual acuity (sharpness of vision). However, gauging whether something is wonky would be a visual discrimination task, which involves more work by the brain. It’s an area in which one’s skill can be improved through learning, and some occupations have a lower discrimination threshold (I e. They can detect smaller differences).