Eyeglass Bevel Types – Quick Reference Guide

Why Bevel Matters

The bevel is the angled cut on the edge of a lens that allows it to fit securely into the frame. Though small, this detail greatly affects fit, durability, safety, and appearance.

  • Fit & Cosmetics: Right bevel = lenses sit flush with the frame. Wrong bevel = gaps, tilt, or exposed edges.
  • Durability & Safety: Correct bevel prevents loosening, popping, or cracking. Wrong bevel risks breakage, especially in high-index lenses.
  • Efficiency: Avoids remakes and delays in patient delivery.

Frame Types & Bevel Requirements

Full-Rim Plastic (Zyl)

  • Needs a standard or safety bevel.
  • Some zyl frames contain a hidden groove that’s hard to see.
  • Important: In plus powers, edge can become knife-thin. Always request groove-edge thickness (≈1.5–2.0 mm)for stability.

Full-Rim Metal

  • Typically uses a V-bevel in a narrow channel.
  • Many also use a groove, which is easier to see than in zyl.

Semi-Rimless (Nylon/Grooved)

  • Requires a groove-cut bevel to hold the nylon cord securely.
  • Sufficient edge thickness must be maintained, especially in plus powers.

Rimless / Drill-Mount

  • Needs a flat, polished edge with no bevel.

Key Takeaways for Opticians

  1. Always check eyewire closely – hidden grooves in full zyl are easy to miss.
  2. Communicate edge thickness needs to the lab (especially in plus powers).
  3. Verify lens fit – the wrong bevel risks cosmetic flaws, poor fit, or breakage.

✅ Bottom Line: Bevel type may be a small detail, but it makes a big difference in lens fit, appearance, safety, and frame longevity. Always check for grooves and ensure proper edge thickness.

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