Medical device prices are typically nosebleed high, so a $70 pair of glasses really doesn't strike me as being expensive at all, relative to other devices, even

Medical device prices are typically nosebleed high, so a $70 pair of glasses really doesn't strike me as being expensive at all, relative to other devices, even if it only cost them $10 to make. A device mentioned in a different thread recently, that looked like it might be very helpful to me, was $4000 for about $50 (at most) of components.