Frequently asked questions about Prime particle online shops and stores and their answers are posted.
Please use it as a reference when purchasing products or using services.

Frequently Asked Questions

Difference between Spherical Lens and Aspherical Lens

Generally speaking, spherical lenses are thick and the images through the lenses will be distorted. While, with the same prescription and index, aspherical lenses are thinner, lighter and more comfortable for wearers. Aspherical lenses have a wider vision and the images through the lenses are more real and natural. Wearers will not feel tired after wearing aspherical lenses for a long time.

Can you replace lenses if I send you my frame?

Sorry, we don't provide lens replacement.

Can I use the copy of my eyeglass prescription which was issued by my doctor 3 years ago?

No. We strongly suggest you use your eyeglass prescription in the most recent 2 years to order with us. Actually, Eye Care Professionals (ECPs) suggest an eye exam every six months or one year to detect any possible eye diseases in the earlier stage.

What is the material of your lens?

Our lenses are made of resin, which is lightweight and highly impact-resistant. Resin lenses also have a strong ability to block ultraviolet radiation to protect your eyes.

How long do I have to wait for my glasses after I ordered them?

Your order may take 7-21 business days to arrive. Usually your glasses will arrive sooner, but depending on the complexity of the prescription and the package selected, it may take up to 21 full business days. Please check our [Delivery & Tracking] page for details.

Why is PrimeParticle so cheap?

Simply put, we cut middleman margins and retail costs while maintaining quality.

Where do you ship to?

We currently ship to the United States and Japan only.


Can't Find what you are looking for?
What do I need to place a prescription order?
Can I cancel my order?
What if I need to change my order?
What if I want to purchase a large quantity of frames?
How long will my order take?
What free gifts do you offer with an order?


How do I get my prescription?
What is my PD? It's not on my prescription
I have a strong prescription that falls outside the range shown on your site. What do I do?
Do you provide bifocals or progressive lenses?


How to measure the size of eyeglasses?


What is the material of your lens?
How to choose lenses?
Difference between Spherical Lens and Aspherical Lens
What're the difference between Tint lens, Photochromic lens and Polarized lens?
What is the difference between single-vision and progressive lenses?
Can I buy lenses only to fit into my old glasses frame?
How to choose the lenses thickness? What is the relationship between lenses thickness and the refractive index?
How to use progressive glasses?


Forget the password?


Do you accept insurance?
Can I get an invoice?

Return & Refund

Do you offer to repair glasses?
What if my order information is wrong?
How to Return Your Glasses?


What can I do if I am required to pay import taxes or customs duties?
What do I do if my package was damaged?
Do you offer expedited shipping?
Do you offer free shipping?
Why is there no update of my package?

Questions or comments? We'd love to hear from you!