What is happening to my dad's eyes?

Please know the signs of a stroke. The sooner you get Dad to a hospital the sooner he gets help and will recover better.

Thank you so much, Shane and Countrymouse. I brought him to the neighbourhood clinic today and the doctor said the same thing too, they arranged an appointment for me with a neurologist 2 weeks from today. Hope everything will be good til his next appointment with a neurologist.

Thank you so much

I agree with Shane. It would make sense especially because if the problem is in his brain, rather than in the eye itself, he wouldn't be aware of it. It's called 'sensory deficit' or 'sensory inattention', and he's no more aware of not seeing what's missing than you are aware of not being able to see what's directly behind your head.

There probably isn't much to be done about this - apart from compensating in a practical way by, for example, placing objects he needs in his line of functioning sight - but you'd better get him examined in case it's a warning sign.

He may have had another stroke. Have him evaluated at the ER if you’ve seen a major change in his symptoms.
Or if you feel it it is not an emergency make an appointment with his neurologist or ophthalmologist for an office visit (many providers are actually seeing patients) and if not- telehealth.