Most of our frames are “one size,” designed to fit a wide range of faces. A few styles come in multiple sizes. Use your current glasses as the best reference, or follow the quick steps below.
1) How to read frame size (on your glasses)
Look inside the temple (arm). You’ll see numbers like: 52□18–140
-
52 = Lens width (mm)
-
18 = Bridge width (mm)
-
140 = Temple length (mm)
Match these to the new frame for the most reliable fit.
2) Quick fit by face width (no glasses handy?)
Use a ruler (millimeters) across your face at the pupils, or try the “credit-card test” (a card is ~54 mm wide).
| Face width | Typical lens width | Typical bridge | Temple length |
|---|---|---|---|
| Narrow | 48–51 mm | 15–18 mm | 135–140 mm |
| Medium | 52–54 mm | 16–19 mm | 140–145 mm |
| Wide | 55–57 mm | 17–21 mm | 145–150 mm |
Tip: Sunglasses often run 1–2 mm larger than optical frames for a comfortable, slightly looser fit.
3) One-size frames—how to choose
-
Compare the listed size to your current frame stamp (e.g., if you wear 52□18–140, look for something close: 51–53 lens, 17–19 bridge, 140–145 temple).
-
If between sizes, pick slightly larger for sunglasses and closer match for optical.
-
Small adjustments (nose pads, temple bend) by an optician can fine-tune the fit.
4) What each number changes
-
Lens width: overall frame width/coverage.
-
Bridge: comfort on the nose; higher bridge = more space.
-
Temple length: behind-ear comfort; longer temples for larger heads or if temples feel tight/short.
5) Common size examples
-
Optical (unisex): 50–54 / 17–19 / 140–145
-
Sunglasses (unisex): 52–56 / 16–20 / 140–150
-
Smaller faces: start at lens width 48–50
-
Larger faces: look at 55–57
6) Still unsure?
-
Match your current frame numbers first.
-
Check our product photos on model notes (if available).
-
You can message us your current size (e.g., 52□18–140) and preferred fit (snug/standard/relaxed)—we’ll suggest options.
Bvlgari
Roman jeweller, Serpenti codes
Founded in Rome in 1884 by Sotirio Bulgari, a Greek silversmith. The eyewear is built from the jewellery archive — Serpenti scales along gold-finish temples, an enamelled snakehead at the hinge, the B.zero1 spiral as temple trim.
Est. 1884
Product details
- ShapeButterfly
- Size55 mm
The Bvlgari BV40002I Serpenti Viper is a butterfly sunglass for women.
Frame
- Model
- Serpenti Viper
- Model code
- BV40002I
- Brand
- Bvlgari
- Designed for
- Women
- Frame shape
- Butterfly
Lenses
- Lens colour
- Brown
- Polarised
- Photochromic
Colour & size
- Frame colour
- Brown
- Colour code
- 54F
- Size
- 55 mm lens
- Size band
Fit & size
Printed inside the temple as
Fit
Size band , as graded by Bvlgari
Estimated from the lens width
Compare with your current glasses
Enter the numbers printed inside the arm of a pair that fits you well.
Delivery & pickup
- 4-hour expressDubai only, on orders placed before 5 pm, Monday to Friday.
- Free UAE deliveryAll emirates, 1–2 working days.
- Collect in storeFrom Dubai Festival City, Ibn Battuta Mall, Outlet Mall and Festival Plaza. Find a branch
Returns & exchanges
- 7-day returnsUnworn, in the original packaging, with the OptiVision tag still attached.
- 14-day exchangesSame conditions — swap at any of our branches.
Warranty & what's included
- 1-year warrantyManufacturer warranty against manufacturing defects. Keep the warranty card from the box.
- Lifetime aftercareFree, unlimited cleaning and adjustments at any of our branches.
In the box
- Original packaging
- Hard case or soft pouch
- Cleaning cloth
- Warranty card
Contents can vary slightly by brand.
Payment options
- CardsCredit and debit cards, processed by Network International.
- WalletsApple Pay, Google Pay and Samsung Pay.
- TabbySplit into 4 interest-free payments.
- Cash on deliveryPay when your order arrives.
