There’s some really interesting stuff around this, once you start digging. I’m aphakic in both eyes (no lenses; they were removed as cataracts when I was a kid) and was blind as a child through some of the critical period of vision development. That left me having what I think can be described as bilateral amblyopia - essentially two ‘lazy eyes’, though that’s not really a good description in the sense that ‘lazy eye’ seems to be commonly misunderstood.

So the weird thing is that both my eyes have a visual acuity around 20/120 or worse; that’s with correction (glasses) and it depends on the day (tiredness/dryness/etc) — but having lived this way my entire life essentially, I find it REALLY difficult to describe what it’s like to people. People think things off in the distance must be ‘blurry’, but that’s not the case at all. It’s more like ‘less detailed’, like if you turn the resolution and texture detail down. It’s not like an unfocused lens at all. There are studies I’ve found that seem to back this up.

Another problem I have that’s related is a nystagmus - both my eyes oscillate involuntarily from side-to-side, separate from the normal saccades (rapid eye movements) that everyone has. You’d think I’d see the whole world oscillating from side to side - but I don’t at all. I don’t usually even notice these movements when I look in the mirror, though I can see them if I’m looking at a video of my own face.

That is, most of the time. There’s one really strange failure mode I’ve observed - PWM-controlled small LED lights or segment displays like on a digital clock, particularly if they’re red but green as well, in a dark room. If it’s dim enough that I can still dimly see what surrounds the display, I can sometimes notice the LED oscillating left and right, WHILE THE STUFF SURROUNDING IT STAYS STILL. It’s really freaking weird!

in short: the eye and brain are complicated!