Your father is young for age related macular degeneration. Risk factors for early ARMD include nicotine use, diabetes, hypertension, elevated cholesterol, obesity and bad family hx. Risk factors for retina detachment RD are high myopia, previous trauma, previous cataract surgery and positive family hx of RD (thus you are at increased risk also). This surgery is brutal. WIthout the surgery the often is completely flind and can "die and shrink" (pthisis bulbi). Even with surgery the vision is often very poor.
You should spend some time talking to the retina surgeon about the status of the remaining eye: 1. does it have ARMD 2. does it have anything that would increase risk of RD 3. Does the other eye need any prophylactic treatment 4. What can your father do to keep his remaining eye healthy. 5. What are the risks to you and your siblings?