I worked in an optical lab about 1971, and they also wholesaled frames. So adjust all figures I give accordingly, but I imagine the ratio of glasses cost to Consumer Price Index is pretty much the same.
In 1971, a typical pair of single-vision glasses, plastic frames, modest prescription (+4 to -4 diopters, sphere) cost about $100 at a U.S. optometrist. Gold-filled glasses were typically $50 more. This was before the discount stores like Lenscrafters, who started selling cheap knockoffs for $50. Of course, these are only crude values for prices, as I remember them; YMMV.
Our lab charged $5 to make two lenses and insert them into the frames. Typical frames were wholesaled to the optometrist at $1.80 each. Gold-filled frames, the most expensive ones we carried, sold for $6.00.
Yes, the markup was fantastic. And the optometrist that owned the lab had a chain of dispensing outlets and also owned the frame wholesaler, and his wife was one of his employees. And the cost of the glasses, lenses and frames didn’t include the cost of an optical examination. Overhead? For a 800-ft hole in the wall lab/warehouse? Not much. You can put a lot of frames and lenses in a room the size of your bedroom. Our entire lens stock fit in a single 4-drawer filing cabinet.
BTW, the lens blanks cost us $.30 each. These are large, circular glass lenses that we cut down to the shape and size dictated by the frames (the optical prescription/curvature was built-in and we didn’t make that – we just chose the correct one from the drawer). We had an automated machine driven by a cam mechanism. It used diamond cutters with a water jacket to grind the edges of one lens down in about 90 seconds, including the compound curve required to make them fit in the frames.
I’m sure today’s equipment is even more automated and it costs even less in time and money to make a custom-shaped lens.
That’s right, Diceman, those “precision-ground optics” cost 30 cents each. Our lab paid double that until they found sources in Japan that were just as good, and a lot cheaper.
How can optometrists get by with this high markup? For somewhat the same reasons doctors can. The laws severly restrict entry into the field. I can prescribe for myself just fine, but no optometrist will accept a prescription from me, since I don’t have the formal credentials.