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If we try to explain it very simply, then two systems of our body are involved in the process of vision — the optical system (with the help of which we receive a light wave) and the brain as part of the nervous system (the brain recognizes and identifies the image).
The process is as follows:
Thus, we can see both with the help of the eyes and with the help of the brain. Therefore, if there is a visual impairment, but the ophthalmologist did not find anything in optik, then it is possible that the problems are caused by a malfunction of the nervous system and a neurologist, or rather a neuro-ophthalmologist, is needed here.
There are diseases, such as multiple sclerosis, where problems can be a signal for more thorough testing and then you can not do without the help of a specialist in the field of neurology.