eyesight

Hello, I wanted to ask if it is important when buying new TV to get higher refresh rate (144Hz) than just normal (50Hz)? The reason why I am asking is that I have bigger cage facing the point where the TV will stand, about 4 meters away from my two budgies. As I read, budgies can see up to...

I'm not sure if this has been answered before. But, I spend most of my time on the computer and mobile. My parrot is also usually nearby me perching while I feed it. Is there a possibility that their eyesight may have an issue in the future like humans do?