Discrete and elegant titanium eyeglasses. Premium frame for its strength and flexibility, try to fold them if you want. What about their weight? So much lighter than other materials like acetate or steel.
There it is your guide.
Most brands have the size printed inside the frame, so you can compare it with your new glasses.
The lens diameter is the width of the lens (in mm), measured from the bridge
The bridge width is the gap above the nose and between the lenses
The lateral length is usually defined by one of these three standard sizes: 135, 140 or 145 mm. The side should be long enough for the glasses to fit comfortably over the ears.