What are the eye diseases that develop with age, and how should we prepare for them?

As I get older, I have come to realize from listening to those around me that eye-related diseases tend to develop.

Recently, someone who had no issues suddenly decided to get an eye exam just in case, and it turned out they had glaucoma, which causes narrowing of the visual field.

I used to think that eyes had nothing to do with anything other than vision, but not anymore.

What are some diseases that develop as people age?

What should we do to prevent such illnesses?

I am seeking good advice.