📏 How smart glasses sizes work

Every pair usually has 3 numbers, like this:

Example: 50 – 22 – 150

• 50 mm = lens width (how wide each lens is)
• 22 mm = bridge width (space on your nose)
• 150 mm = temple length (arm length over your ears)

📐 Real example (popular smart glasses)

For something like the Ray-Ban Meta Wayfarer:

• Small/Standard:
  • Lens: ~50 mm
  • Bridge: ~22 mm
  • Arm: ~150 mm
• Large version:
  • Lens: ~53 mm
  • Bridge: ~22 mm
  • Arm: ~155 mm

👉 So the difference between sizes is just a few millimeters, but it changes how they fit your face.

📊 General size ranges

• Small faces:
  • Lens: 45–50 mm
• Medium (most people):
  • Lens: 50–54 mm
• Large faces:
  • Lens: 55–62 mm

🧠 Easy way to think about it

• Smaller numbers → tighter fit
• Bigger numbers → wider/looser fit
• Most people fit around 50–53 mm lenses