Tetra
The Retro Super Future // Tetra blends vintage inspiration with contemporary Italian craftsmanship. Defined by its oversized rectangular silhouette, Tetra features thick sculpted acetate rims, rounded lens openings, and distinctive chiseled edges that create a bold architectural look. The frame balances retro character with modern sophistication, making it a standout statement piece for everyday wear. Handmade in Italy, Tetra showcases RSF's signature attention to detail, premium materials, and timeless design. Includes RSF box case and cleaning cloth.
We offer free shipping to anywhere in the United States, charge $20 USD to ship to Canada and Mexico, and $40 USD to ship anywhere else around the world. For more info on our Shipping Rates.
We offer a 20-day return policy for all of our eyewear purchased online. Purchase of 2 or more frames will be subject to a 8% restocking fee for each frame that is returned. Prescription lens purchases are eligible for a 50% refund. For more info on our Return Policy.
Rx Lens Service
Prescription lenses, added to any frame.
Single-vision or progressive in three lens materials. From $169 with anti-reflective coating included. FSA/HSA accepted.
Add any frame to your cart to get started.
Specs Assist
See any frame on you, before you buy.
Send us a photo and your frame picks — our team renders the frames onto your face and emails it back within 24 hours.
Frame
Tetra Black
Lens
Sunglass Lens Options
Subtotal
$ 229
Choose a Prescription Type
Select one to continue
Choose Lens Material
Select an option to continue
Sunglass Lens Options
Select a lens type to continue
Choose a Polarized Lens Color
Select your polarized tint — eliminates glare with 100% UV protection
Dark Gray
Reduces overall brightness without altering color perception. Great for bright, sunny conditions and everyday wear.
Brown
Enhances contrast and depth perception. Ideal for outdoor activities and variable light conditions.
Grey-Green (G15)
Balances color and contrast while reducing glare. Originally developed for pilots; offers true-to-life color perception.
Choose a Tint Color
Select your sunglass tint — all tints include 100% UV protection
Match Frame Tint
We'll replicate your frame's original lens color — the easiest choice if you love how they already look.
Dark Gray
Reduces overall brightness without altering color perception. Great for bright, sunny conditions and everyday wear.
Brown
Enhances contrast and depth perception. Ideal for outdoor activities and variable light conditions.
Grey-Green (G15)
Balances color and contrast while reducing glare. Originally developed for pilots; offers true-to-life color perception.
Other
Enter a custom tint color below. We'll do our best to match your request.
Your Prescription
How would you like to provide your prescription?
Call My Doctor
Share your doctor's details and we'll handle the rest
We'll contact your doctor's office within 1–2 business days to request your prescription on file.
Pupil Distance
One last step before checkout
Pupil distance (PD) is the distance in millimeters between the centers of your pupils. It's used to align the optical center of your lenses with your eyes. Most adults have a PD between 54–74 mm. You can find it on your prescription or ask your eye doctor.
Measure Your PD
We recommend using the EyeMeasure app for accurate results
Use your iPhone's TrueDepth camera to measure your pupil distance in seconds. It's the same technology used by opticians.
