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Hello. Thank you for asking your question. My name is***** will try to help.
It really sounds like he is in distress. It is also not safe for a blind cat to live outside. I would put him to sleep for sure.
One thing I am thinking is he may have kidney disease. That is very common in cats as they age. It can cause high blood pressure which can cause the blood supply to the eye to be compromised which leads to loss of vision. It also causes an increase in thirst and urine output.
I think he is crying because he is afraid an distressed.
It sounds more like lit is related to the blindness than dementia.
Usually with dementia they have trouble using the litter box because they forget they know how to use it. They forget things like where there food is and who their people are as well as appropriate response to human interaction.
It sounds like he is in rough shape to me.
Usually animal control will euthanize at no charge. The SPCA and Humane Societies will euthanize at no charge or for a minimal donation.
Does that help? Do you have any additional questions?