I just bought my first pair of glasses ever last week. I was adventist hospital for something else entirely and I noticed they had an occulist office so I first got the eye check for the prescription and then went next door to their glasses shop.
The check up cost about NT$300 and the frames I liked best just happened to be the cheapest at about NT$850. They then offered me a couple of levels up for the lenses starting from cheap scratchable plastic up to unsctrachable glass. I forget what the increment was in each level but I took the top level unscratchable glass. Total was $3750.
I did not comparison shop because I had no idea anywhere else I could get it all done in English and I figured Adventist, being a reputable hospital, wouldn’t rip me off. I checked with Taiwanese friends who say I did not pay too much and some have paid upwards of NT$5,000 for light, frameless glasses. All in all I am very pleased with the service and glasses I got at Adventist. They are very good for healthcare also, btw.