In the manufacture of lenses, slabs of glass are cut with a glass saw or slitting disk; a piece of the desired type and shape is chipped to a rough, round blank, or the pieces may be heated to softness, rolled to a round shape, and pressed in a mold to the desired size and to approximately the desired curvature of the ...
What are semi finished lenses used for?
More videos on YouTube Semi-finished lens is the raw blank used to produce the most individualized RX lens according to thepatient's prescription. Different prescription powers request for different semi-finished lens types or base curves. The semi-finished lenses are produced in a casting process.
What is the purpose of the blue film on the surface of the semi finished blank?
AR-System: It also called AR coating or hard multi coated, means coat an anti-reflective film on the hard coating . It can perfectly reduce light reflection and glare , enhance functional and charity of your vision .