Various kinds of blockers are used for lens processing systems are:
• Base Alloy Blocker
• Eclipse Blocker
• Wax Blocker
Lens grinding is performed at BM Optical Lab Ltd. in an ecologically responsible manner using ultra-modern wax blockers to secure the lens and create today’s lens designs with greater accuracy and environmental care.
Using wax blockers is more economical compared to alloy, as wax is significantly cheaper. Lens grinding with ultra-modern wax blockers results in better quality lenses with reduced center thickness.
The wax blocker is used to hold each lens securely in place during the grinding and polishing processes. The technician places each lens blank into an automated generator—a grinding machine calibrated for the optical prescription. The generator grinds the precise optical curves into the back of each lens. After this step, the lenses undergo fining and polishing.
The front of each lens is then polished through a series of fining operations. First, each lens is rubbed against a rough fining pad made of soft sandpaper.
Once the initial fining process is completed, the two pads are removed and discarded, and the lenses are soaked in hot water for a few moments. The laps are then reattached to the lenses, which are placed back in the fining machine. A final fining pad is applied, and the machine rotates the pads in a circular motion while a polishing compound—consisting of aluminum oxide, water, and polymers—flows over the lenses.
The technician then selects lens samples that match the shape of the eyeglass frames. These samples, along with the lenses, are inserted into an edging machine. The machine grinds each lens to its proper shape and adds a bevel around the edge, ensuring a perfect fit within the eyeglass frames. Water flows over the lenses throughout this process.
