If anyone can give me a good reason why the dog I seen (Labradoodle) should have its hair completely covering his eyes (so you can't even see the dogs eyes) then please tell me why

Well I cant tell you why that dog had its hair over its eyes, but I can explain why my breed does,  I have a coated breed, which when in full coat will cover the eyes,   the breed is bred to work all day out in the sun on the sea,  so the covering of coat over the eye protects the eyes from the sun,   bit like wearing sunglasses.    believe me, my boy has no problem with his sight,  he can see a crumb a mile off.

I have never heard of the hair protecting the dogs eyes from the sun, that's interesting. What is the breed, if you don't mind me asking

"Yes some in a minority of dogs it could cause an issue like with anything else (using a collar, feeding certain foods ect) but with a long coat any deasont owner should notice if their dog is having an issue and would then tie up the coat or clip it to solve the problem"

I agree.