Eyeglass Size Guide: How to Choose the Perfect Fit
Choosing the right glasses size is essential to ensure comfort, stability, and a harmonious look. A frame that is too large tends to slip, while one that is too small can feel tight and disproportionate.
In this guide, we explain how to read glasses measurements, how to find the most suitable size for your face, and what aspects to consider when choosing the ideal frame.
How to read glasses measurements
Inside the temple arm or bridge, you will find a series of numbers that indicate the frame size. This information is very useful for understanding if a model might be suitable for you.
Typical example:
50□18–140
They mean:
- Lens width (50 mm) – The horizontal measurement of each lens.
- Bridge width (18 mm) – Distance between the lenses, the part that rests on the nose.
- Temple arm length (140 mm) – The length of the arm that extends behind the ear.
These values help you choose sunglasses and prescription glasses with the correct fit for your face.
What is the right size for you?
Based on lens width, glasses are generally divided into three categories:
- Size S (small) – Lenses up to 50 mm, suitable for smaller faces.
- Size M (medium) – Lenses between 51 mm and 54 mm, ideal for most people.
- Size L (large) – Lenses over 55 mm, indicated for wider faces or for those who prefer an oversized effect.
If you already have a pair of glasses that fit you well, check the measurements engraved on the inside of the temple arm: you just need to look for a model with similar dimensions.
How to measure your face
If you don't know your size, you can easily find it with a ruler or a soft tape measure.
Measure the distance between your two temples, from one side of your face to the other, and compare it with this table:
- Less than 129 mm → Size S
- Between 130 mm and 139 mm → Size M
- More than 140 mm → Size L
If you are between two sizes, choosing the slightly larger one usually ensures greater comfort.
Sunglasses and prescription glasses: is there a difference?
Sunglasses tend to have slightly larger frames than prescription glasses to offer better UV protection. However, the method for choosing the size remains the same: always check the frame measurements and ensure they are proportionate to your face.
Find the perfect size at Ottica Mineo
Now that you know the main measurements and how to interpret them, you can choose the most suitable model for your needs with greater confidence. In our catalog, you will find a curated selection of sunglasses and prescription glasses designed for different styles and face shapes.