What is a roll and polish on eyeglass lenses?

A roll and polish is an edge treatment that rounds the sharp corners of a cut lens edge and then polishes the surface to a smooth, glossy finish. It makes the lens edge comfortable to touch and visually appealing. It is essential for rimless and semi-rimless frames where the lens edge is visible, and beneficial for any lens where comfort and cosmetics matter.

What is a safety bevel on a lens?

A safety bevel is a small flat or rounded edge applied to the front and back corners of a spectacle lens. It removes the sharp corners that can chip during frame insertion or daily wear, makes the lens safer and more comfortable to handle, and is standard practice for full-rim lens fabrication.

How can I make thick lenses look thinner?

Several edge treatments help reduce the visibility of thick lens edges. Edge tinting (coloring the edge) and edge frosting (creating a matte finish) make thick edges less noticeable. Combining these with a higher-index lens material, smaller frame size, and a frame with a thick eyewire that conceals more of the edge produces the best cosmetic result for high prescriptions.

Do all lenses need edge treatments?

All lenses benefit from at least a safety bevel to prevent chipping. Beyond that, the need depends on the frame type. Rimless frames require a full roll and polish. Semi-rimless frames need the exposed edge polished. Full-rim frames are adequately served by a safety bevel alone in most cases. High minus prescriptions benefit from additional cosmetic treatments regardless of frame type.

Edge Treatments: Roll & Polish, Safety Bevel, and Cosmetic Edge Options

What Are Edge Treatments?

Edge treatments are finishing processes applied to the cut edge of a spectacle lens after it has been edged to fit the frame. These treatments serve two primary purposes: improving the cosmetic appearance of the finished lens and enhancing the safety and comfort of the eyewear. While edge treatments are often considered a cosmetic upgrade, some are functionally necessary depending on the frame type and prescription.

Roll and Polish

A roll and polish is the most common edge finish. The edger rounds the sharp corners of the lens edge and then polishes the surface to a smooth, glossy finish. The result is an edge that feels smooth to the touch and has a clean, finished appearance.

Roll and polish is particularly important for:

Rimless (drill-mount) frames: The lens edge is fully exposed and visible, so a polished edge significantly improves the cosmetic appearance
Semi-rimless frames: The exposed portion of the lens edge benefits from polishing
Plus lenses: Plus lenses have thin edges that can be sharp; polishing removes the sharpness

For rimless frames, always specify a roll and polish. An unfinished lens edge in a rimless mounting looks unfinished and can feel sharp against the skin. Many labs include this automatically for rimless orders, but it is good practice to confirm.

Safety Bevel

A safety bevel is a small flat or rounded edge applied to the front and back corners of the lens. Unlike a full roll and polish, a safety bevel is a more subtle modification that simply removes the sharp corners without creating a fully rounded, polished edge.

Safety bevels serve several purposes:

Prevent chipping: Sharp lens corners are prone to chipping during frame insertion and daily wear. A beveled corner is more resistant to damage.
Improve comfort: Eliminates sharp edges that could scratch or irritate the skin
Reduce glare: A small bevel on the front edge can reduce the reflections sometimes visible at the lens periphery

Safety bevels are standard practice for full-rim frames. They add minimal cost and processing time while meaningfully improving the durability of the finished product.

Hide Edge (Cosmetic Edge Treatments)

For patients with high minus prescriptions, the thick lens edges can be a significant cosmetic concern. Several treatments address this:

Edge Tinting / Coloring

The lens edge is painted or coated with a dark color (usually matching the frame or in a neutral tone) to make it less visible when the glasses are worn. This reduces the appearance of thick, clear edges that catch light and draw attention.

Edge Frosting

The edge is given a matte, frosted finish instead of being left clear. Frosting scatters light rather than transmitting it through the edge, making thick edges less noticeable.

Edge Polishing with Tint

Combining a polish with a dark tint creates the most finished appearance for exposed minus lens edges.

Treatment	Best For	Effect
Roll and polish	Rimless, semi-rimless, plus lenses	Smooth, glossy, finished appearance
Safety bevel	All full-rim lenses	Removes sharp corners, prevents chipping
Edge tinting	High minus in any frame	Hides thick edge visibility
Edge frosting	High minus in any frame	Scatters light at thick edges

Neglecting to discuss edge treatments with patients who have high minus prescriptions. These patients are often self-conscious about thick lens edges. Proactively offering hide-edge options demonstrates attention to the patient's cosmetic concerns and can significantly improve satisfaction.

Edge Treatments by Frame Type

The appropriate edge treatment depends on the frame type:

Full-rim frames: Safety bevel is standard. The eyewire hides most of the edge, so cosmetic edge treatments are less critical unless the frame does not fully conceal the edge thickness.
Semi-rimless frames: The exposed portion should be polished. The cord-grooved portion does not need cosmetic treatment since it is hidden by the cord.
Rimless frames: Full roll and polish is essential. Edge tinting or frosting is optional but recommended for minus lenses.

Grooving for Semi-Rimless Frames

While not strictly an edge treatment, grooving is an edge modification specific to semi-rimless frames. A groove is cut along the exposed edge of the lens to accept the nylon retention cord. The groove depth and width must match the cord diameter for secure retention. Grooves that are too shallow allow the cord to slip out; grooves that are too deep weaken the lens edge.

Faceting

Faceting is a cosmetic edge treatment that cuts flat, angled surfaces (facets) along the lens edge, similar to the facets of a gemstone. This is a purely aesthetic option found on high-end and custom eyewear. Faceting adds visual interest to the lens edge and can make thick edges appear as a design feature rather than a flaw.

Edge treatments are one of the most overlooked dispensing opportunities. They are relatively inexpensive to add but can significantly improve the patient's satisfaction with their eyewear, especially for rimless frames and high prescriptions. Make edge treatments part of your standard dispensing conversation.

Clinical Relevance

Edge quality affects both durability and patient perception. A lens with rough edges chips more easily, feels sharp during handling, and looks unfinished. Proper edge treatment prevents warranty claims, reduces remakes due to chipping during insertion, and elevates the perceived quality of the finished eyewear.

Key Takeaways

Roll and polish creates a smooth, glossy edge essential for rimless and semi-rimless frames
Safety bevels remove sharp corners and prevent chipping in full-rim frames
Hide-edge treatments (tinting, frosting) reduce the visibility of thick minus lens edges
Edge treatments should match the frame type: full polish for rimless, safety bevel for full-rim
Grooving is required for semi-rimless frames to accept the nylon retention cord
Proactively offering edge treatments improves patient satisfaction, especially for high prescriptions