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Comment by gregpilling | Hacker News Reader

quote from the article: "Even using precise measurements, which we’ll get to in a second, your new virtually-bought glasses can turn out to be uncomfortably tight, annoyingly loose or simply ill-fitting, regardless of the stated measurements"

Which was my experience. Apparently I have an extra wide head, so even the widest frames didn't fit right. Since I only need the glasses for seeing details, it is not that big of a problem, but I spent a lot of time measuring my head and eyes to get a bad result.

Maybe Apple will build a 3D head modeling software into the IphoneX and revolutionize glasses! a new app idea!

In the meantime, I just increased font size on my monitor!

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The best way to determine fit is with a physical frame as a starting point. Even 1mm can make a difference. If you don't want to visit a local store to try on frames, you can buy cheap (non-stylish) frames on eBay for less than $10. Once you find a few frames that fit, use those frame measurements as search criteria. Frame eye width + bridge width should be ~= PD, otherwise lens will not be centered and one lens edge will be thicker than the other.

Warby Parker has physical stores where you can try on frames and they are happy for you to purchase from them online. They have an app that uses the iPhone X to measure your head, but Apple limits the camera depth resolution, so it's not much more useful than sending a photo to a good optician.

When you said the widest frames "did not fit right" and you got "a bad result", what exactly do you mean: poor vision from the glasses, slid down your nose, temples too tight/short/long, did not look good? With the current trend in oversized glasses, there are more wide frames available than narrow ones. Online frame sizes can be confusing because of "base curves", so two frames that say 55-20-140 can have different widths. EyeBuyDirect and Zenni (and likely others) provide actual frame widths, although these are sometimes off by a few mm. Frames with nose pads are easier to adjust.

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