Your shopping cart
😊 Product added to your cart.
Product removed from your cart.
Lens width
The widest horizontal point of one lens opening. It helps determine overall frame width and the amount of lens material.
Online fit guide
How to Choose an Optical Frame Online
A good optical frame must fit your face and work with your prescription. Compare a current frame first, then consider bridge design, lens shape, material and the advice of the professional fitting your lenses.
Step 1
Understand the frame measurements
Cosmoshop displays optical-frame sizing as 54.20/140. The numbers are millimetres and describe the frame, not your prescription.
54Lens width
.
20Bridge width
/
140Temple length
Bridge width
The space between the lenses. The bridge must carry the frame securely without pinching or allowing constant sliding.
Temple length
The arm length from hinge to tip. Correct length lets the arms curve behind your ears without excessive pressure.
Do not use lens width by itself.
A 54 mm rectangular frame can be much wider than a 54 mm round frame. Compare the complete size, total frame width, lens height and bridge construction whenever those measurements are available.
Step 2
Check the frame against your face
Eyes centred
Your pupils should sit reasonably close to the optical centre of the lens openings, not near the extreme edge.
Stable bridge
The frame should stay in place when you look down without needing constant adjustment.
Level frame
The top of the frame should appear level rather than noticeably tilted. An optician can make small adjustments after purchase.
Correct width
The temples should leave the hinges without bowing sharply outward or pressing heavily into the sides of your head.
Cheek clearance
The lower frame should not lift when you smile or rest heavily on your cheeks.
Comfort behind ears
Temple ends should curve comfortably and hold the frame without creating concentrated pressure.
Bridge options
Adjustable nose pads offer greater control over height, angle and weight distribution. Fixed acetate or plastic bridges create a seamless look but need a closer natural match to your nose shape.
Step 3
Make sure the frame suits your prescription
Your optometrist or dispensing optician should make the final compatibility decision. The following principles help narrow the choice.
Stronger prescriptions
Smaller, rounder lens openings and full rims can often reduce visible edge thickness and lens weight. Ask about high-index lens options.
Progressive lenses
The lens needs sufficient vertical depth for distance, intermediate and reading zones. Confirm the minimum fitting height before ordering the frame.
Rimless and semi-rimless
These can be lightweight, but not every lens material or prescription is ideal for exposed or drilled lens edges. Professional confirmation is important.
Frame size is not pupillary distance.
Your PD and fitting height are personal lens measurements taken for optical alignment. Do not estimate them from the 54.20/140 frame code. Where prescription lenses are not included, have them supplied and fitted by a qualified optical professional.
Step 4
Choose a frame material for comfort and use
| Material | What to expect |
|---|---|
| Acetate | Substantial feel, rich colours and patterns, and a fixed bridge. Fit depends strongly on the bridge shape. |
| Stainless steel / metal | Usually slimmer and often fitted with adjustable nose pads. Can be easier to fine-tune. |
| Titanium | Lightweight and corrosion resistant. Often chosen for comfort, especially for all-day wear. |
| Injected or nylon-based frame | Light and durable with flexible styling options. Adjustment methods vary by construction. |
Consider the finished weight.
The frame is only part of the weight. Larger lenses and stronger prescriptions can add substantial weight, so a smaller or lighter frame may be more comfortable for long wear.
Before ordering
Optical-frame purchase checklist
- I compared the 54.20/140-style measurements with my current glasses.
- The frame width, bridge and temple length suit my face.
- The lens height and shape suit my prescription and visual needs.
- I understand whether the bridge is fixed or uses adjustable nose pads.
- The material and expected finished weight suit all-day wear.
- My optical professional can fit the required lenses into this frame.
- I checked what is included, plus the warranty and return information.
Common optical-frame questions
Can I simply order the same printed size as my current glasses?
It is the best starting point, but not a guarantee. Compare the frame shape, total width, bridge design and lens height as well as the three printed measurements.
What frame is best for a strong prescription?
Smaller, rounder full-rim frames often help control lens thickness and weight, but the final choice should be confirmed by the professional making your lenses.
Do I need my PD to choose a frame?
PD is required for accurate lens positioning, not for reading the frame size. Your optometrist or dispensing optician should measure it rather than deriving it from the frame.
Compare before you commit
Shop optical frames using a frame that already fits
Keep your current size and prescription requirements beside you while checking each product.
Disclaimer
Unless otherwise stated, Cosmoshop NZ is not owned by or affiliated with the brands it sells. All trademarks and brand names shown on our pages are the property of their respective companies, which retain all rights.
For brands where we are authorised dealers, we offer the manufacturer’s warranty. Otherwise, our default 1-year CosmoCare warranty applies.