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Original Ray-Ban RB4378 Replacement Lenses

Price range: $15.99 through $22.99

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

11 - GRAY GRADIENT - PLASTIC

13 - BROWN GRADIENT - PLASTIC

2V - DARK BLUE POLARIZED - PLASTIC

71 - DARK GREEN - PLASTIC

80 - DARK BLUE - PLASTIC

87 - DARK GREY

8G - GRAY GRADIENT - PLASTIC

Size

Clear

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Description
Additional information

Description

Original Ray-Ban RB4378 replacement lenses

Bring your Ray-Ban RB4378 back to life with original Ray-Ban replacement lenses instead of buying a new frame. It is a smart way to save up to 60%, keep the sunglasses you already love and enjoy free shipping.

Model compatibility

These lenses are made for the Ray-Ban RB4378 in size 54. They are not intended for similar-looking Ray-Ban frames or replicas, because small differences in the lens groove can affect the fit.

How to identify your model and size

Check the inside of the temple arm. You should find RB4378 and the lens size 54 printed on the frame. If the marking has faded, compare the square lens shape and measure your old lens carefully before ordering.

Main features

Brand: Ray-Ban
Model: RB4378
Size: 54
Lens diameter: 59 mm
Lens material: polycarbonate
Shape: square
Lens curve: Base 6
Use: sunglasses
Adult fit
Product type: original

Available colours

13 – Brown gradient – Plastic
11 – Grey gradient – Plastic
8G – Grey gradient – Plastic
2V – Dark blue polarized – Plastic
5Q – Polar purple – Plastic
71 – Dark green – Plastic
80 – Dark blue – Plastic
87 – Dark grey

Material, protection and lens finishes

These RB4378 lenses are made of polycarbonate, a lightweight and impact-resistant material for everyday sun use. They provide UV400 protection, blocking 100% of UVA/UVB rays. Lens options include gradient finishes, dark colours and polarized versions only where the option is specifically marked as polarized.

Why replace only the lenses

If your RB4378 frame is still in good condition, replacing the lenses is the most sensible choice. You save money, reduce waste and keep the exact frame that already fits you. You can also browse more original Ray-Ban lenses.

Authenticity and logo

We are an official EssilorLuxottica distributor. Original Ray-Ban lenses include the Ray-Ban logo, and polarized versions include the Ray-Ban P marking. In our optical workshop in Granada, qualified opticians check lenses with a lensmeter and work with MEI Easy Fit Trend equipment.

FAQ

Will they fit other Ray-Ban models? No. These replacement lenses are for Ray-Ban RB4378 size 54, and even very similar frames may not hold the lens correctly.

How do I confirm my sunglasses are RB4378? Look inside the temple for RB4378 and size 54. If you are unsure, send us a photo and we can help confirm compatibility.

Are these genuine Ray-Ban lenses? Yes. They are original Ray-Ban lenses from the official EssilorLuxottica channel and carry the correct Ray-Ban logo.

Can I choose polarized lenses? Yes, in the options marked 2V dark blue polarized and 5Q polar purple. Polarized lenses reduce glare and improve comfort in bright conditions.

Can I install them at home? The RB4378 injected frame normally uses pressure fitting with gentle heat. If you are not used to this type of work, an optician can install them more safely.

Is it worth repairing instead of buying new sunglasses? In most cases, yes. If the frame is healthy, new original lenses restore clarity at a fraction of the cost of a complete pair.

Additional information

color	11 – GRAY GRADIENT – PLASTIC , 13 – BROWN GRADIENT – PLASTIC , 2V – DARK BLUE POLARIZED – PLASTIC , 71 – DARK GREEN – PLASTIC , 80 – DARK BLUE – PLASTIC , 87 – DARK GREY , 8G – GRAY GRADIENT – PLASTIC
Size	54