Glasses Size Guide
Find the Perfect Glasses Size for Comfort, Vision and Style
Choosing the correct glasses size makes a huge difference to how your eyewear looks, feels and performs. Whether you're buying your first pair of prescription glasses or replacing your current frames, understanding glasses frame measurements will help you choose glasses that fit comfortably, provide clear vision and suit your face shape.
At Ilkeston Factory Specs we are easily reached from Nottingham, Derby & Leicester. We stock one of the largest selections of prescription glasses and designer frames in the East Midlands, including extra-small, standard, wide-fit and extra-large glasses for adults.
What Do Glasses Frame Measurements Mean?
Most glasses have three measurements printed on the inside of the arm.
Example: 52□18-140
These numbers represent:
Eye Size (Lens Width)
The width of one lens measured in millimetres. This is usually between 46mm and 58mm.
Bridge Width
The distance between the two lenses that sits over your nose. A comfortable bridge ensures your glasses stay securely in place.
Temple Length (Arm Length)
The length of the side arms that fit over your ears. Most frames range from 135mm to 150mm.
These three measurements work together to provide a comfortable and balanced fit.
How to Measure Your Glasses
If you already own a pair of glasses that fit well, simply look inside one of the temples for the measurements.
If the numbers have worn away, you can measure them yourself using a ruler:
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Measure the width of one lens.
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Measure the bridge between the lenses.
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Measure the length of the side arm.
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Compare these measurements when choosing new frames.
Using your existing glasses is one of the easiest ways to find your ideal frame size.
Glasses Comparison Guide
Frame Size | Lens Width | Best For |
|---|---|---|
Extra Large Faces | 58MM+ | Very Wide |
Large Faces | 55-57MM | Wider Faces |
Medium Faces | 52-54MM | Average Adult |
Small Faces | 49-51MM | Small Adults |
Extra Small Faces | 46 -48MM | Very Narrow |
Choosing the Right Glasses Size
If you have a wider face, look for:
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Lens widths of 55mm or larger
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Wider frame fronts
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Longer temple arms
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Frames that sit comfortably without pinching
Wide-fit glasses provide improved comfort and a more balanced appearance.
For narrower faces, choose:
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Lens widths below 50mm
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Narrow frame designs
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Shorter temple lengths
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Lightweight frames that stay securely in place
Smaller frames help keep your glasses correctly aligned and prevent slipping.
Don't forget to check out our
Glasses for Face Shapes Guide
Why Choosing the Correct Size Matters
Poorly fitting glasses can cause several problems, including:
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Glasses slipping down your nose
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Pressure around your ears or temples
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Reduced comfort throughout the day
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Incorrect lens positioning that affects your vision
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Frames that appear too large or too small for your face.
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Correctly fitted glasses improve comfort, vision and overall appearance.
Professional Glasses Fitting in Ilkeston
While measurements are useful, nothing replaces trying glasses on with expert guidance.
Our experienced team will help you:
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Measure your ideal frame size
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Recommend styles that suit your face shape
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Ensure your lenses sit in the correct position
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Adjust your glasses for maximum comfort
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Find the perfect fit without the guesswork
Many customers also take advantage of our same-day glasses service, available on selected prescriptions.
How Should Glasses Fit?
A correctly fitted pair of glasses should:
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Sit comfortably on your nose without slipping.
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Rest evenly on your ears without creating pressure.
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Keep your eyes centred within the lenses.
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Stay in place when you bend forward.
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Feel comfortable enough to wear all day.
If your glasses constantly slide, pinch your temples or leave deep marks on your nose, they may need adjusting or you may require a different frame size.
At Ilkeston Factory Specs, we professionally measure and adjust every pair of glasses to ensure the lenses sit correctly in front of your eyes, providing maximum comfort and the best possible vision.
Frequently Asked Questions
What is the average glasses size?
A common adult frame size is 52-18-140, although the ideal measurements vary depending on your face shape and preferred style.
How do I know if my glasses are too small?
Frames that pinch your temples, leave marks on your nose or sit too high are usually too small.
How do I know if my glasses are too large?
Oversized frames may slide down your nose, move when you walk or position the lenses incorrectly in front of your eyes.
Can you help me choose the right size?
Yes. We professionally fit every customer in-store and can recommend frames that suit your face shape, prescription and lifestyle.
Can glasses be adjusted if they don't fit properly?
Yes. Most glasses can be professionally adjusted to improve their fit and comfort. Small adjustments to the nose pads, temples and frame alignment can stop your glasses from slipping, reduce pressure behind your ears and ensure your lenses sit correctly in front of your eyes. If your frames are the wrong size, however, it may be better to choose a different frame that fits your face more comfortably.
How do I measure my face for glasses?
The easiest way to measure your face for glasses is to use a ruler while looking in a mirror. Measure the width of your face from temple to temple and compare it with the frame width of your current glasses if they fit well. You can also check the measurements printed inside the arm of your existing frames, such as 52□18-140, which indicate the lens width, bridge width and temple length. For the most accurate fit, visit Ilkeston Factory Specs, where our experienced team can professionally measure your face and help you choose frames that suit your features, prescription and lifestyle.
Related Services
If you're looking for new glasses or replacement lenses, these services may also be helpful:
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Wide Fit Glasses
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Small Frame Glasses
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Same-Day Glasses
This guide is intended for adult glasses. Children's frame sizes differ and should be professionally measured.
Find Glasses That Fit Perfectly
Choosing the right size shouldn't be a guessing game.
Let our experienced team help you find comfortable, great-looking glasses that fit properly the first time.
Whether you need small, standard or extra-large frames, we'll help you choose eyewear that feels as good as it looks.
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Small or Large broken frame replacements
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No appointment needed
👉 Visit Ilkeston Factory Specs in Ilkeston for professional glasses fitting, expert advice and one of the largest selections of prescription glasses and designer eyewear in the East Midlands. We'll measure your ideal frame size, adjust your glasses for maximum comfort and help you find eyewear that looks and feels perfect.
Visit Today – No Appointment Needed