Now that you have read the first four sections of this article, you should have the measurements of an eyeglass frame that will fit you. Now you should be ready to shop for an eyeglass frame online. Here's how to do it.
Once you have the measurements of your frame, you can shop for a frame online that will fit you.
Remember, you have a leeway of a few millimeters on each element, with a caveat: Stick to no more than two millimeters higher or lower on the bridge. For example, if your perfect bridge measurement is 18 millimeters, you can go as low as two below that, 16 millimeters, or as high as two above, 20 millimeters. Therefore, a bridge that’s anywhere between 16-20 millimeters should fit you just fine.
Also, if you’re getting a frame with adjustable nose pads, this gives you even more leeway, because the nose pads can be adjusted for the best fit. Pinch them closer together to make the bridge fit more snugly and rest higher on your nose; spread them apart to loosen the fit and let them rest lower on your nose.
On the frame width, lens width, and lens height, you should be fine with a leeway of three millimeters. Therefore, if your perfect frame is 135 millimeters wide, frames between 132-138 millimeters should fit you just as well.
Since many temple arms are adjustable at the curve where the temple arm bends behind your ear, you have a leeway of as many as four millimeters. In that case, if the temple arm on your eyeglasses is 140 millimeters, you will be fine with a temple arm that falls between 136-144 millimeters. However, many temple arms are not adjustable, especially those made of aluminum alloy, titanium, memory titanium, and memory plastic.
Check the temple arm material listed in the description of the frame to be sure. Also, look at an enlarged picture of the online glasses. If you can see that embedded in the temple arm is a stainless steel rod, you can be confident that this frame’s temple arm is adjustable.
Here are a few more things to keep in mind. The vintage styles from 50 years ago and more that are popular today were often worn much smaller than glasses are today. This is because lenses were made of glass then, and the heaviness of glass caused eyeglasses manufacturers to keep the lenses as small as possible.
Conversely, eyeglasses in the ’70s were frequently over-sized.
Another thing to keep in mind is how strong your prescription is. If you have a strong prescription, plus or minus 6.00, the wider and thicker your lenses will be, on the outer edge with a minus sphere (nearsighted) prescription, in the middle with a plus sphere (farsighted) prescription. Therefore, if you have a strong prescription you may want to stick with lens widths that are lower than 50 millimeters. Good luck.