# How can glasses from Internet vendors be so cheap? How about quality? **URL:** \ **Category:** Factual Questions\ **Created:** [December 3, 2020, 1:06pm UTC](https://boards.straightdope.com/t/how-can-glasses-from-internet-vendors-be-so-cheap-how-about-quality/927106 "2020-12-03T13:06:16Z")\ **Posts on this page:** 1\ **Showing post:** 37
**Author:** ![Q.Q.Switcheroo](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/q.q.switcheroo/32/5713_2.png) [@Q.Q.Switcheroo](https://boards.straightdope.com/u/Q.Q.Switcheroo)\ **Post date:** [December 6, 2020, 9:52pm UTC](https://boards.straightdope.com/t/how-can-glasses-from-internet-vendors-be-so-cheap-how-about-quality/927106/37 "2020-12-06T21:52:33Z")
> [@Dallas\_Jones](#): > > There is no reason that the elaborate lens machine they use for you to say, “is this better or worse” can not be replaced by a machine that you can look into, adjust your view like a pair of binoculars, and get your own setting to order glasses. > [@Why is optometry stupid?](https://boards.straightdope.com/t/why-is-optometry-stupid/504018): > > Suppose I’m given a pair of binoculars. I look through them at something, and it’s fuzzy. So I rotate the little knob on top of the binoculars. I turn it one way, the image gets fuzzier, so I turn it the other way. It gets sharper. By making minute analog adjustments, correcting for small errors, I can get the image as sharply focused as I’d like. And after I’m done, somebody could probably use the position of the focus wheel to determine how far away the object I was looking at is. Then I go t… --- _[View the full topic](https://boards.straightdope.com/t/how-can-glasses-from-internet-vendors-be-so-cheap-how-about-quality/927106)._