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 by using very ultra-modern wax blocker to block the lens and create today's lens designs more accurately and more watchful of the environment.
Using was blocker is economical as compared to alloy and it reduces the cost of making lens as the wax is much cheaper than alloy. Lens Grinding by using ultra-modern wax blocker makes better quality lenses with less center thickness.
The wax blocker is used to hold each lens in place during the grinding and polishing processes. The technician then places each plank into the automated generator, a grinding machine that is set for the optical prescription. The generator grinds the appropriate optical curves into the back of each lens. After this step, the lenses must be fined and polished.
The front of each lens is then polished in a series of fining operations. First, each lens is rubbed against a rough fining pad made of soft sandpaper.
After the initial fining process is completed, the two pads are peeled off and thrown away and the lenses are soaked in hot water for few moments. The laps are then attached back on the lenses and placed in the fining machine where the final fining pad is attached. The fining 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 selects the lens samples that matches the shape of the eyeglass frames and inserts the sample and the lenses into an edging machine. The machine grinds each lens to its proper shape and places a bevel around the edge of the lens so that the lens will fit the eyeglass frames. Water flows over the lens all through this process.
