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Random mutations were supposed to slowly cause the evolution of a process that lead to the creation of eyes, ears, etc
Random mutations and natural selection. The latter is kinda important.
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But if this took millions of years to happen, what about all these years? Did organisms had a limited visual capacity or limited interpretation of visual stimuli?
Yes, and they still do. Humans in particular have a number of issues with their vision.
The funny things is that any vision is better than no vision and directional vision is better than just being able to detect light.
I might wear glasses and be blind in one eye, so that I have no depth perception, but even my seriously flawed vision is far better than no vision at all.