A properly fitting eyeglass frame makes as much difference to your personality as a properly tailored suit. If you’ve tried to order glasses online, you’ve probably felt confused about the terms and sizing methods requested by various companies. Here, we’ve complied a comprehensive guide which will be of immense help for you to choose the right fit for yourself.
Base on Frame Dimensions
The better your frames fit, the better they flatter your face. Consider searching for your glasses as you would for a pair of shoes–first of all, you need to know about the frame dimensions. Actually, the frame size incorporates three key figures, all of which are measured in millimeters. 
1) Total Width: the width of the frame from one screw to the other, ensuring the frame fits the width of your face. It is very important for you to select the suitable frames online.
2) Lens width: the width of the lenses, ensuring the frame fits the width of your eye and temporal bone.
3) Bridge width: the distance between two lenses, ensuring the frame fits your nose.
4) Temple length: the length of the temple from each screw to its ears.
How to Find Your Size?
You can measure your old pair of glasses to get the dimensions that fit you the best, or you can also read the dimensions of your old pair, whose size data is usually listed on the temple arm.
We divide our frames into 3 categories: Narrow, Medium and Wide, which represents the total width of the frame. Once you have gained the accurate data, you can sort by different size.
Narrow and small face: smaller than 135mm
Medium sized face: 135mm to 140mm
Wide face: larger than 140mm
Figure Out Your Face Shape
The following are five common face shapes:
1) A round face has curved lines with the width and length in the same proportions and no angles. Thus angular frame shape with angular edges and corners,creating perfect feeling of stereo.
2) An oval face has slightly wider cheekbones and a gentle narrowing at the forehead and jaw, therefore any style such as square or round frames with equal width of the broadest part of the face can keep its natural balance.
3) A heart face is more like an upside down triangle, with a wide forehead that narrows to a pointed chin, which tends to have high, angled cheekbones, for example Jennifer Aniston. To make the forehead look smaller and chin look broader, we recommend light narrow and round frames, which can add width to the lower facial section and balancing the width of your face.
4) A square face has more angular lines with equally wide cheekbones and forehead, such as Olivia Wilde and Rosario Dawson. Round or oval frames have streamlined frames with soft shape which will soften the angles and adding contrast to strong facial features.
5) A triangle face is widest at the jaw and gradually narrows through to the forehead, then frames with strong brow line (semi-rimless and top heavy styles) will balance the upper face and the jaw.
You can read our blog: https://bit.ly/faceshape1 to figure out your face shape and the recommended frames.
Consider Your Prescription
First and foremost, glasses belong to medical device. In order to get the best wearing experience, keep in mind to review your prescription. As we all know that for myopic prescription, the lenses are always thicker at the edges than in the center. If your prescription is less than -2.00, almost any frame size or shape will be suitable, while the lenses also have cosmetically acceptable edge thickness. Recommendation:
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Most of current trendy frames are made of plastic or metal with rims thinner than the lenses themselves. Also popular are rimless frames that leave the lens edge completely exposed. When it comes to the prescriptions over -2.00 but below -6.00, smaller frames should be considered to avoid edge thickness, thus semi-rimless or full frames both are suitable.
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For those over -6.00, wearers with serious prescription should be aware that large frames with a wider lens is not recommended, and full frames can be best choice. Or you’d better choose the rimless mounting, high-index lenses contribute to thinner edge, lighter weight and greater comfort.
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Here you should notice that, progressive lenses have specific requirements for frame height and shape, in order to ensure the accurate segment height and enough space for three viewing areas. Usually, the frame height should be among 30-40mm, thus some unique styles like aviator and cat eye frames cannot be taken into consideration when choosing frames for progressives, or the reading area may be cut off.
Consider Your PD
If you’ve never worn glasses before, you might not know that the pupillary distance (PD) is a very important and valuable number. It’s a measurement in millimeters between your eyes from the center of one pupil to the center of the other. Typically, an adult’s PD falls in a range from 55 to 75 mm, and a kid’s is somewhere between 42 to 55 mm.
-The importance of PD in choosing frame
Only correct PD on your glasses prescription will guarantee that you can look through the ideal spot in your lenses. If your PD is not accurate, the lenses will not be matched up properly with your eyes and your glasses won’t be as effective as they should be either.
-How to measure your PD 
Usually, your PD is measured by your eye care professional in an eye exam and it should be included in your prescription receipt. However you can also measure it by yourself.
Step 1. Stand about 25cm (9.84 inches) away from a mirror. Hold the ruler over your eyes.
Step 2. Close your right eye and use your left eye to look straight at the mirror. Keep the ruler’s “0” measurement exactly in line with the center of your left pupil.
Step 3. Close your left eye and open your right eye while looking straight, and the number right directly over your right pupil is your PD.
Step 4. Repeat at least three times to make it accurate.
Here you should notice that for bifocal and progressive lenses, two PD values are needed. In such case, we recommend you to get your PD directly from the optometrist.
Check Your Nose Fit
In order to stay in place, your frame needs something such as your nose to hold on. Thus it is crucial to find a frame that is comfortable to fit for your nose. Generally speaking, you should take the height of your nose bridge into consideration and avoid any red marks or indentation. Tips:
As for girls, be careful that don’t let your eyelashes touch your lenses. In addition, if you have small eyes, just keep away from large-size glasses which will make your eyes look even smaller.
Try Them On
While you get your pair, just try them on, tilt your head forward and shake vigorously from side to side.
If the frame doesn’t complement you to perfection, never be worried. Firmoo’s friendly exchange&return policy promises our customers 100% satisfaction. Just log in your account center and apply for the exchange&return, once we received your request, your exclusive CSR will email you to solve the issue.
Come to Firmoo and select the perfect eyeglass frame to enhance your looks and lifestyle today!