Name: Ray-Ban 3578 Replacement Lenses
Brand: ReplacementLenses
SKU: 339
Availability: InStock

Ray-Ban 3578 Replacement Lenses

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

11 - GRAY GRADIENT - PLASTIC

13 - BROWN GRADIENT - PLASTIC

Size

Clear

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Original Ray-Ban RB3578 replacement lenses

If your Ray-Ban RB3578 frame still fits perfectly but the lenses are scratched, replacing only the lenses is the smart way to bring them back to life. These original Ray-Ban replacement lenses preserve the look, fit and UV protection of your sunglasses, with free shipping and savings of up to 60% compared with buying a complete new pair.

Model compatibility

These lenses are made specifically for original Ray-Ban 3578 / RB3578 frames. They are not universal lenses and should not be fitted into other Ray-Ban models or replica frames, even if the shape looks close at first glance.

Compatibility is defined by the model number and the correct size, not by the frame colour. If your frame is an authentic RB3578 and the size matches, the fit should be precise.

How to identify your model and size

Look inside the temple arm of your sunglasses. You should find the model reference RB3578, followed by frame colour and size information. For this product, the size is 50.

The lens size is usually shown next to the bridge measurement, for example in a format such as 50□. Do not measure the lens diagonally with a ruler or try to force a different size into the frame; on a metal rim, even a small mismatch can prevent correct closure.

Main features

Brand: Ray-Ban
Compatible model: 3578 / RB3578
Product type: original
Size: 50
Lens diameter: 53 mm
Lens material: polycarbonate
Shape: Phantos
Lens curve: Base 6
Use: sunglasses
Audience: adult
Compatible frame material: metal
UV400 protection: blocks 100% UVA/UVB rays

Available colours

13 – Brown gradient – Plastic
11 – Grey gradient – Plastic

Both lens options keep the original gradient style of the RB3578 and are ideal when you want a clean, factory-look refresh without replacing the frame.

Material, protection and lens finishes

These lenses are made from polycarbonate, a lightweight and resistant material for everyday sunglass use. The Base 6 curve helps preserve the original visual line and fit of the Ray-Ban RB3578.

They provide UV400 protection, blocking 100% of UVA and UVB rays. In our optical workshop in Granada, qualified opticians check every lens with a lensmeter before dispatch.

Why replace only the lenses

The metal frame of the RB3578 is built to last. If the frame is still in good condition, replacing the scratched or worn lenses is usually far more sensible than buying a full new pair.

You save money, reduce waste and keep the frame that already fits your face. Since 2018, ReplacementLenses.net has repaired more than 600,000 glasses, processed more than 400,000 orders and shipped to over 50 countries.

Authenticity and logo

We are an official EssilorLuxottica distributor. These original Ray-Ban lenses include the Ray-Ban logo used on original replacement lenses; when a polarised variant is available and selected, the logo is Ray-Ban P.

Originality matters not only for appearance, but also for optical quality and UV protection. We do not supply generic copies when the product is listed as original.

Frequently asked questions

Are these lenses compatible with Ray-Ban RB3447 Round Metal?

No. These lenses are cut for the Ray-Ban RB3578 only. Similar round or phantos-style metal frames use different lens shapes and rim dimensions.

Can I fit them into a Ray-Ban 3578V frame?

Check the exact reference printed inside the temple arm before ordering. The safest rule is simple: the frame must match RB3578 and the size must be 50.

How do I know if my RB3578 is size 50?

The size is printed inside the temple, usually beside the bridge measurement in a format such as 50□. Measuring the lens with a ruler is less reliable, especially on curved lenses.

Will they fit replica frames?

We do not recommend it. Original Ray-Ban lenses are made to fit authentic RB3578 rims; replica frames can differ by fractions of a millimetre and fail to close correctly.

Are these lenses polarised?

Only lens options clearly marked as polarised should be considered polarised. The colours listed for this product are gradient options without a polarised indication.

Is installation risky on a thin metal frame?

The RB3578 metal rim is normally opened by loosening the rim screw slightly. When the correct lens is used, it should seat into the groove without forcing the bridge or bending the frame.