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Sunglasses and Eyeglasses Size Guide

Choosing the correct eyewear size can be a frustrating and uncertain experience, as identifying the perfect frame goes beyond simple style selection. Factors such as face shape, bridge size for a comfortable nasal fit and temple length for optimal stability are crucial elements for finding the right fit. 

Fortunately, you don't have to navigate these complexities alone. Our comprehensive eyewear dimensions guide breaks down key frame measurements, empowering you to confidently select the dimensions that best suit your needs. 

How to read glasses size?

You have likely noticed a series of small numbers engraved on the inside of the temple arm and wondered what they mean. These figures are the key to how to read glasses size correctly; they indicate the precise frame dimensions.

The first two numbers indicate the lens width (also known as caliber) and the bridge width. The third number indicates the temple length. These values are always displayed in this specific order and measured in millimeters (mm) for international accuracy.

Lens Width (Caliber): This is the horizontal width of just one lens at its widest point. It’s the most important number for determining the overall fit and style of your frames.

Bridge Width: This is the distance between the two lenses. It represents the part that rests on your nose, ensuring your glasses stay comfortably in place without slipping.

Temple Length: This is the total length of the arms of the glasses, measured from the hinge to the very tip that curves behind your ear for a secure fit.

How to find the perfect fit?

If you don't have your current frames nearby or if this is your first purchase, don't worry. You can easily determine which size is perfect for you. Follow the steps below to find your fit:

STEP 1 Take any credit, debit, or loyalty card	STEP 2 Stand in front of a mirror, hold the card steady and align one edge with the center of your nose

Now all you have to do is checking the position of the card. The size you should choose is determined based on where the opposite edge of the card aligns with your eye.

SMALL SIZE	MEDIUM SIZE	LARGE SIZE
Card edge extends past the corner of your eye? Choose a Small size. We recommend frames with a lens width up to 47mm.	Card edge aligns with the corner of your eye? Choose a Medium size. We recommend frames with a lens width ranging from 48 to 51mm.	Card edge ends before the corner of your eye? Choose a Large size. We recommend frames with a lens width of 52mm and up.

The Optician’s masterclass: how the pros verify your perfect fit

Beyond simple measurements, a truly professional fit is about how a frame interacts with your unique facial anatomy. Our team of expert opticians has compiled this insider guide to help you recognize a "clinical" fit-  

The Pupillary Centering (The "Golden Rule")

An optician's first check is always the eyes. When looking straight ahead, your pupils should be perfectly centered (or slightly above center) within the horizontal width of the lenses. If your eyes look too close to the inner corners or the top rim, the frame is technically misaligned for your face shape.

The Bridge "Pinch & Slide" Test

The bridge is the most critical point of contact. Expert advice: your frames should rest comfortably on the bridge of your nose without pinching the skin or leaving deep red marks.

• The Pro Tip: If you see "daylight" between your nose and the frame bridge, the fit is too wide and will inevitably slide.

Anatomical Temple Ergonomics

The "arms" (temples) shouldn't just be long enough; they must follow the curve of your head.

• The Optician’s Secret: You should feel zero pressure on your temples. The grip should happen only behind the ear. If the frames "squeeze" the sides of your head, they are too narrow, which can lead to chronic headaches.

Cheekbone Clearance & The "Smile Test"

A common mistake is choosing frames that sit too low. Our opticians recommend the Smile Test: when you laugh or smile, the bottom of the frames should not touch your cheeks. If the frames move or tilt when your face muscles move, the "B-measurement" (lens height) is too large for your features.

The Eyelash Clearance

From a clinical standpoint, there should be a 10-12mm distance (the "vertex distance") between your cornea and the lens. If your eyelashes touch the glass, the fit is too shallow. This isn't just annoying; it causes constant smudging and can interfere with your vision.

Need a second opinion?

Don’t leave your comfort to chance. If you're stuck between sizes, reach out to our dedicated Customer Service team. Whether through a phone call (+39 015 20479) or at info@otticanet.it, our experts will help you decode the measurements and find the frames that best complement your features.