Synergy 6004
£ 84 Original price was: £ 84.£ 59Current price is: £ 59.
A unisex square frame in matt black/grey or matt blue/brown. Soft colour fade.
- Size: 53-18-140 mm, lens depth 38 mm
- Frame: Full Rim, Plastic
- Colours: Matt Black/Grey, Matt Blue/Brown
- Case & microfibre cloth included
- Lenses made in our UK labs
- Free delivery
- Free 30-day returns
About the Synergy 6004
Synergy 6004 Prescription Glasses
Square frames have a confident, modern look that works almost anywhere. The Synergy 6004 is a unisex full-rim plastic square frame, sized 53-18-140, in Matt Black/Grey or Matt Blue/Brown. You can order it with single vision, varifocal or bifocal lenses made to your prescription. You will find it in our Synergy range.
Choosing your Synergy 6004 colour
Matt Black/Grey. In Matt Black/Grey, the frame is matte black that fades to grey. It is the safest choice if you only want one pair, and it never looks out of place.
Matt Blue/Brown. The Matt Blue/Brown version is matte blue that fades to brown. It flatters warm and olive skin and works with almost any outfit.
Each colour is shown in the gallery, so you can compare them side by side before you decide.
Why you will like it
Square lenses add structure to round and oval faces and make features look more defined. The colour fades from darker at the top to lighter at the bottom, which gives the frame depth and keeps it from looking heavy.
Look for the little studs at the corners, a classic detail that lifts the whole frame. The matte finish looks modern and keeps fingerprints and shine to a minimum. Plastic keeps the weight down and allows richer, deeper colour than metal.
Whether it is your main pair or a spare, the Synergy 6004 is easy to live with.
Styling tips
Because it is unisex, it is easy to share the look across the household. Pick the colour that matches your wardrobe rather than worrying about who it is designed for.
How it fits
| Brand | Synergy |
|---|---|
| Frame | Full Rim, Plastic |
| Colours | Matt Black/Grey, Matt Blue/Brown |
| Frame size | 53-18-140 mm (lens width, bridge, arm length) |
| Lens depth | 38 mm |
| Designed for | Men, Women |
At 53mm per lens, it sits in the medium range, the most common adult fit. The 18mm bridge is average. The 140mm arms are a standard length. Across the lenses and bridge it measures about 124mm.
The easiest way to check is against glasses you already love. Most frames show their size inside the arm; if yours are close to these, you are in safe territory.
Lens options for the Synergy 6004
Your optician’s prescription will usually tell you which of these you need:
- Single vision: one prescription across the whole lens, for distance, reading or the computer.
- Varifocal: near, intermediate and distance in one lens, with no visible line.
- Bifocal: a separate reading segment in the lower part of the lens.
- Ready readers: simple magnification if you just need help with close work.
The 38mm lens depth gives varifocal lenses plenty of room. If your prescription is high, a high-index lens keeps things thin. An anti-reflective, scratch-resistant coating is a sensible extra for everyday wear. Spend a lot of time on screens? This frame is also part of our blue light glasses range.
Ordering online is simple
You need a valid prescription from your optician and your pupillary distance (PD), the distance between your pupils. Many opticians include your PD on the prescription; if yours does not, just ask for it. Choose your colour, pick your lens type, enter your details and add any lens upgrades. If you are unsure about size, compare the measurements above with a pair you already wear.
Made for you in our UK lab
Pick your colour and lenses, add your prescription and PD, and our UK lab cuts your lenses and fits them into your Synergy 6004. Every pair is checked before it leaves us.
Looking after them
Clean your lenses with a microfibre cloth rather than your jumper, keep them in their case when they are in your bag, and do not leave them on a sunny car dashboard. Our lens care guide has more tips.
FAQs
Can I get varifocal lenses in the Synergy 6004?
Yes. The 38mm lens depth gives varifocal lenses enough height for all three vision zones.
Can I wear the Synergy 6004 for driving?
Yes. Single vision or varifocal lenses work well for driving, and an anti-reflective coating helps cut glare from headlights at night.
What size is it?
It is size 53-18-140: 53mm lens width, 18mm bridge and 140mm arms, a medium fit.
Is it unisex?
Yes. It suits men and women.
What does the colour fade look like?
The colour is darker at the top of the frame and becomes lighter towards the bottom.
Do you make the lenses yourselves?
Yes. Every pair is made to order in our UK optical lab, where your lenses are cut to your prescription and fitted into your frame.
Not quite the one? Take a look at our women’s glasses, men’s glasses and prescription glasses.
Lens prices
Lens types
| Lenses | Single Vision | Bifocal | Varifocal |
|---|---|---|---|
| 1.5 Index (standard) | FREE | ÂŁ40 | ÂŁ69 |
| Transitions | ÂŁ50 | ÂŁ90 | ÂŁ119 |
| Sunglasses tint | ÂŁ10 | ÂŁ50 | ÂŁ75 |
| Blue light filter | ÂŁ30 | ÂŁ70 | ÂŁ99 |
Basic 1.5 Single Vision lenses with anti-reflection coating are included in the frame price.
Thinner lens upgrades
| Lens index | Single Vision | Bifocal | Varifocal |
|---|---|---|---|
| 1.6 + HMC | ÂŁ30 | ÂŁ70 | ÂŁ95 |
| 1.67 + HMC | ÂŁ50 | ÂŁ90 | ÂŁ119 |
| 1.74 + HMC | ÂŁ70 | – | ÂŁ135 |
Higher index lenses are thinner and lighter, and are worth it for stronger prescriptions. All include an HMC coating.
Frame details & size guide
Specifications
| Color | Matt Black/Grey, Matt Blue/Brown |
|---|---|
| Eye Size | 53 |
| Brand | Synergy |
| Lens Depth | 38 |
| Temple Length | 140 |
| Bridge Size | 18 |
| Type | Optical |
| Material | Plastic |
| Wearer | Men, Women |
| Rim | Full Rim |
How to read frame sizes
The three numbers (for example 48-20-140) are the lens width, the bridge and the arm length in millimetres. Compare them with a pair you already own.

Delivery, returns & what is included
Delivery
- Single Vision: 5-7 working days
- Bifocal: 7-10 working days
- Varifocal: 7-10 working days
- Dispatched within 48 hours by tracked Royal Mail service
Delivery is free. Your estimate for your country is shown at checkout.
Returns & exchanges
Free 30-day returns or exchanges. If your glasses are not right for you, we will make it right.
What is included
- Anti-reflection lenses included
- Case and microfibre cloth
- Lenses made in our UK optical lab
- All frames CE marked
- Worldwide delivery
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