Retina detachement and close to losing eyesight

Hi,
My name is Kevin. I am writing on behalf of my dad. He is 60 years old.

He lost one eye 20 years ago due to failed catract and infection. Now he has prosthetic eye instead.

In his other eye, he went through retina detachment in Jan 2016. Doc fixed the eye with gas bubble and a buckle.
But the retina got detached again in couple months. There were 5 laser and Cryo operated to fix it. Because his retina is very thin it kept on detaching.

Right now after 1.5 years his LOWER retina is still detached, there is fluid behind the retina causing it to rise little but there is a gel which is forcing the retina not to move. Doc has been examining him for past 9 months in this state and advised to leave it as is, as its only 1 eye. If the retina gets fully detached, then the fluid can be removed and treated. Macula is also swollen due to which he has very low central vision.

Above all sometime last year, in trials to attach back the retina doctor removed the cataract lens that was placed 20 years back. Now he wears glasses, which helps him not more than 10%. He is extremely sensitive to light and goes blind for few hours if he is exposed to intense sunlight.

What would you suggest us to do?
Does someone have experience of living with detached retina?
How long can retina stay detached?

Any advice, inputs are greatly appreciated.

Kind regards,
kevin