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A spin coating is a process used in optical labs to apply a uniform liquid coating, such as a hard coat or tint, to the surface of a spectacle lens. The coating liquid is poured onto the center of the lens, which is then rapidly spun.
read more about spin coating for eyeglass lenses ...The spinning process works by using centrifugal force. As the lens spins at high speed, the liquid coating spreads evenly across the surface of the lens until the desired thickness is achieved. The speed and duration of the spin control the final thickness of the coating.
Spin coating is commonly used for applying hard coats (anti-scratch protection), tints, and sometimes the base layer for other treatments. It is the preferred method for applying a thick, durable, and consistent layer.
A uniform thickness is needed for consistent performance. If the coating is thicker on one side than the other, the lens might warp slightly or the color tint might look uneven. The spin coating process provides a uniform finish.
Coatings applied via spin coating should be maintained carefully. Avoid wiping them dry, which causes dust to drag across the lens and slowly damage the protective layer. Always clean lenses with a wet spray and a microfiber cloth to maintain their integrity.
No, the polishing pad is non-abrasive. It relies on a chemical slurry to achieve the final smooth, clear finish.
No, fining is a required step between rough grinding and polishing. Skipping this step would result in a hazy, unusable lens.
No, fining pads are used in surfacing to shape the large lens blank. Edging uses hard grinding wheels to cut the lens perimeter to frame size.
Spin coating is used to apply protective hard coats or AR layers. If you notice a "swirl" pattern or uneven tint on your lens, the coating process may have been flawed. Poor coating uniformity can cause prismatic distortions that lead to headaches.
Optical Laboratory Association. Surfacing and Finishing (ola-labs.org). 2024.
The Vision Council. Laboratory Processing Standards (thevisioncouncil.org). 2023.
Review of Optometry. Lens Coating Durability (reviewofoptometry.com). 2024.
ABDO. Spectacle Lens Production (abdo.org.uk). 2024.