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As for 'errors', yes, they are typically signs of trauma or dysfunction along the neurons that go into V1. You can have people that have blindsight or that can't tell faces apart in the upper half of their vision. You can get some pretty tragic stuff.

You can also have glaucoma or other 'typical' diseases of the eye. Things like blindspots from welding or lasers.

The visual system in healthy people is already a bit odd. You have the foveal blindspot, the differing distribution of rods and cones, the unseeing neurons that do light sensation for melanin production, etc.

Really, the whole sensory chain is one giant bag of 'wait, it does that? huh?'

https://en.wikipedia.org/wiki/Riddoch_syndrome




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