I've always followed the normal route--I have employer provided vision insurance, I would get myself tested every two years by a optometrist that my insurance covered, and I would buy glass using the prescription from the optometrist or a glasses store supported by my insurance. I don't have anything special in my glasses--single focal, no tinting or light sensitivity, and my glasses weren't remotely stylish, and I'd…
Here's a useful program someone in the HN/YC universe could write - something that uses your computer or phone camera to measure your interpupillary distance. This is a bit tricky to do yourself with a ruler and a mirror. Just have the user take a selfie while holding some object of known dimensions on their forehead. Like a dollar bill. Find the eyes and pupils (OpenCV can do that), find the reference object, calcul…
If Apple opens up the depth sensor on the iPhone camera, such apps will be more accurate.