Arrived at Hoi two nights ago. Yesterday went to look for an optometrist to get prescription multifocal sun glasses. Ended up going to Thien Phu on 333 Nguyen Due Hieu Street. The glasses were ready within 24 hours and the price, including a nice frame, was $130 (well below the $350 I was quoted for in Australia, for the lenses only!).
The optometrist was nice, courteous and helpful person.
From my perspective, highly recommended.