A polishing pad or button for ophthalmic lenses has a flexible cover and a substantially rigid base. The cover has cutouts in a gyre or spiral pattern that may be eccentric from the geometric center of the button. The cutouts may enhance distribution of a polishing fluid across the working surface of the button as the button is moved across a lens. The base may have an undercut around its periphery, which may cause the button to attain a domed shape for conformance to a concave, convex, or saddleback lens surface as the button is pressed against the lens. The button may be used in a conventional lens polishing apparatus.

A polishing tool for polishing a workpiece by holding a polishing material between the workpiece and its polishing surface, the polishing tool including: a main shaft part that has the polishing surface at a front end and that extends along a polishing axis; a plurality of elastic parts that are continuous from the main shaft part and that extend radially outward; and a plurality of seat parts that are continuous to the radially outside of the plurality of elastic parts. A position at which the main shaft part connects to each of the elastic parts and a position at which the corresponding seat part connects thereto are different in a direction of the polishing axis.

A spiral magnetorheological polishing method for mid-frequency error control is provided, relating to the technical field of optical polishing. The method includes: scanning along a polishing path by using a magnetorheological polishing method, and removing a material in a spiral manner with a polishing tool to achieve spiral magnetorheological polishing of a workpiece. An angle between a scanning direction and a workpiece material removal direction is changed in real time during scanning, to alter a spatial posture of a removal function on a polishing surface in a spiral manner, thereby reducing mid-frequency errors. The method further includes: during scanning, randomly changing a processing line spacing in real time to further achieve suppression of mid-frequency ripple errors. A scanning strategy employs raster scanning processing; when the scanning strategy employs raster scanning processing, the processing line spacing is a raster scanning spacing.

A device and a method for polishing an optical lens or an optical mirror use a polishing tool and a workpiece holding ring for accommodating the optical lens or the optical mirror. The workpiece holding ring is arranged above the tool in a vertical direction, and the device has three axes, which are movable during the polishing process, for moving the workpiece holding ring and the polishing tool.

A device and a method for polishing an optical lens or an optical mirror use a polishing tool and a workpiece holding ring for accommodating the optical lens or the optical mirror. The workpiece holding ring is arranged above the tool in a vertical direction, and the device has three axes, which are movable during the polishing process, for moving the workpiece holding ring and the polishing tool.