How do semi-rimless lenses hold in place?

Understanding the Mechanics of Semi-Rimless Lenses: How They Stay Securely in Place

Semi-rimless glasses, a stylish and modern eyewear choice, have always intrigued with their design – lenses seemingly floating with only half a frame supporting them. But how do these chic frames hold the lenses securely in place? Let’s unravel the clever engineering behind semi-rimless lenses.


1. The Design of Semi-Rimless Frames

  • Partial Frame Structure: Semi-rimless frames, also known as half-rim frames, feature a design where the top part of the lens is enclosed in a frame, while the bottom part remains unframed.

2. The Role of a Nylon Thread

  • Securing the Lens: The most common method for securing the lenses in semi-rimless frames is the use of a thin, strong nylon thread or wire. This thread runs along the bottom edge of the lenses, holding them firmly in place.
  • Invisible Support: The nylon thread is nearly invisible, giving the illusion that the lenses are floating.

3. Grooving and Mounting the Lenses

  • Custom Grooving: The lenses for semi-rimless glasses are specially grooved along the edge to accommodate the nylon thread. This groove must be precisely cut to ensure a snug fit.
  • Expert Mounting: The lenses are then carefully mounted into the frame, and the nylon thread is threaded through the groove, securing the lens in place.

4. The Importance of Professional Fitting

  • Precision is Key: Fitting semi-rimless lenses requires precision and expertise. It’s essential that this is done by a skilled optician to ensure the lenses are secure and the frames fit comfortably.

5. Durability and Adjustments

  • Maintenance and Care: While durable, semi-rimless frames may require occasional adjustments to ensure the nylon thread remains taut and the lenses stay securely in place.
  • Handling with Care: It’s also important to handle these glasses with care, as the semi-rimless design can be more delicate than full-rimmed frames.


Semi-rimless glasses offer a blend of elegance and sophistication, with a unique design that requires careful construction. The use of a nylon thread for lens security is a testament to the innovative solutions in eyewear design. Understanding the mechanics behind these stylish frames can enhance your appreciation of their design and the importance of professional fitting and maintenance.


Enquire To Buy