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Original Ray-Ban RB3688 Replacement Lenses

Price range: $17.99 through $26.99

Size chart

Clothing Size Conversion Chart
Category	US	EU	UK	Chest (in)	Waist (in)	Hips (in)
Men	XS	44	34	32-34	26-28	33-35
	S	46	36	34-36	28-30	35-37
	M	48	38	38-40	32-34	39-41
	L	50	40	42-44	36-38	43-45
	XL	52	42	46-48	40-42	47-49
Women	XS	32	6	31-32	24-25	33-34
	S	34	8	33-34	26-27	35-36
	M	36	10	35-36	28-29	37-38
	L	38-40	12-14	37-39	30-32	39-41
	XL	42	16	40-42	33-35	42-44
Youth	XS	128	7	26-28	23-24	26-28
	S	134	8	28-30	24-25	28-30
	M	140	10	30-32	25-26	30-32
	L	146	12	32-34	26-27	32-34
	XL	152	14	34-36	27-28	34-36

Pants Size Conversion Chart
Category	US	EU	UK	Waist (in)	Hip (in)	Inseam (in)
Men	28	44	28	28	34	30
	30	46	30	30	36	31
	32	48	32	32	38	32
	34	50	34	34	40	33
	36	52	36	36	42	34
Women	0	32	4	24	34	30
	2	34	6	25	35	30
	4	36	8	26	36	31
	6	38	10	27	38	32
	8	40	12	28	40	32

Shoes Size Conversion Chart
Category	US	EU	UK	Foot Length (in)
Men	6	39	5.5	9.25
	7	40	6.5	9.625
	8	41	7.5	10
	9	42	8.5	10.25
	10	43	9.5	10.625
	11	44	10.5	11
	12	45	11.5	11.25
	13	46	12.5	11.625
Women	5	35	2.5	8.5
	6	36	3.5	8.875
	7	37	4.5	9.25
	8	38	5.5	9.625
	9	39	6.5	10
	10	40	7.5	10.25
	11	41	8.5	10.625
	12	42	9.5	11
M (Unisex)	5	37	4.5	8.75
	6	38	5.5	9
	7	39	6.5	9.5
	8	40	7.5	10
	9	41	8.5	10.25
	10	42	9.5	10.625
	11	43	10.5	11
	12	44	11.5	11.25

color

31 - GREEN - CRYSTAL

AN - BROWN POLARIZED - CRYSTAL

B1 - DARK GREY - CRYSTAL

K8 - DARK GREY POLARIZED - CRYSTAL

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Description
Additional information

Description

Original Ray-Ban RB3688 replacement lenses

If your Ray-Ban RB3688 sunglasses are scratched or damaged, replacing only the lenses is the smart way to bring them back to life. These original Ray-Ban lenses restore the look, vision and sun protection of your frame, with free shipping and a specialist optical workshop behind every order.

Compatibility with the model

These replacement lenses are made for the Ray-Ban RB3688 model. Because they are original Ray-Ban lenses, the fit depends on your frame being genuine and on choosing the correct size. We do not recommend fitting them into replicas or similar metal frames, as even a very small difference in the rim can affect the final fit.

How to identify your model and size

Check the inside of the temple arm before ordering. You should find the model code “RB3688” followed by the lens size, such as 52, 55 or 58. That number is the size you need to select.

This product is available in sizes 52, 55 and 58, with lens diameters listed as 56 mm, 60 mm and 63 mm. Do not try to adapt the wrong size by sanding or reshaping the lens; on a metal frame, the lens must match the rim precisely.

Main features

Product type: original Ray-Ban lenses.
Compatible model: Ray-Ban RB3688.
Brand: Ray-Ban.
Available sizes: 52, 55 and 58.
Shape: square.
Lens material: glass.
Lens curve: Base 6.
Use: sunglasses.
Audience: adult.
UV400 protection: blocks 100% UVA and UVB rays.

Available lens options

31 – Green – Crystal.
B1 – Dark grey – Crystal.
AN – Brown polarized – Crystal.
K8 – Polar dark grey – Crystal.

If you want polarized lenses for your Ray-Ban RB3688, choose a lens option clearly marked as polarized, such as AN or K8.

Material, protection and lens finishes

These RB3688 replacement lenses are made of glass and feature a Base 6 curve for sunglass use. They provide UV400 protection, blocking 100% of UVA and UVB rays. As original Ray-Ban lenses, they preserve the authentic visual finish and optical feel expected from the brand.

Why replace only the lenses

The metal frame of the Ray-Ban RB3688 is built to last. When only the lenses are scratched, buying a whole new pair is usually unnecessary. Replacing the lenses can save you up to 60% compared with purchasing new sunglasses, while reducing waste and keeping the frame that already fits you well.

You can also browse our range of original Ray-Ban lenses for other Ray-Ban models.

Authenticity and logo

We are an official EssilorLuxottica distributor. Original Ray-Ban lenses include the Ray-Ban logo, and polarized versions feature the Ray-Ban P marking. In our optical workshop in Granada, qualified opticians check every lens with a lensmeter before dispatch.

Since 2018, we have repaired over 600,000 pairs of glasses and processed more than 400,000 orders in over 50 countries. That experience helps us prevent size, compatibility and fitting issues before your lenses leave our workshop.

Frequently asked questions

Are these lenses only for Ray-Ban RB3688? Yes. They are intended for the Ray-Ban RB3688 and should be fitted to a genuine frame in the correct size.

How do I know whether I need size 52, 55 or 58? Look inside the temple arm for the RB3688 reference and the lens size. Select the same number when ordering.

Can I adapt the lenses if I choose the wrong size? No. Glass lenses for a metal rim should not be sanded or forced, as this can cause chips, breakage or poor retention.

Are they genuine Ray-Ban lenses? Yes, these are original Ray-Ban lenses. They include the Ray-Ban logo, and polarized options carry the Ray-Ban P marking.

Do they provide real UV protection? Yes. They provide UV400 protection, blocking 100% UVA and UVB rays.

Are these glass or plastic lenses? The lens material for this product is glass. This helps preserve the original feel and quality of the RB3688.

Will they fit RB3688CH or special editions? Always check that your temple reads RB3688 and that the size matches. If your original lenses had a specific finish, choose an equivalent option only when it is available in the product selector.

Additional information

color	31 – GREEN – CRYSTAL , AN – BROWN POLARIZED – CRYSTAL , B1 – DARK GREY – CRYSTAL , K8 – DARK GREY POLARIZED – CRYSTAL
Size	52 , 55 , 58