High precision rigid gas-permeable contact lens edge curve polishing lathe

A high precision rigid gas-permeable contact lens edge curve polishing lathe, comprising:

• a machine body;
• a waste liquid trough provided on an upper surface of the machine body;
• a concave lens holder and a convex lens holder provided in parallel inside the waste liquid trough, wherein the concave lens holder and the convex lens holder are capable of rotating circumferentially;
• a first crank and a second crank respectively disposed on a base of the machine body at two sides of the machine body;
• a first rotating spindle and a second rotating spindle respectively provided inside the first crank and the second crank, wherein
• a polishing sponge holder provided at an end of each of the first rotating spindle and the second rotating spindle, wherein the polishing sponge holder is capable of rotating circumferentially, and wherein the first crank and the second crank can rotate along a lateral surface of the machine body to enable the polishing sponge holder to engage a lens held on the concave lens holder or a lens held on the convex lens holder;
• and
• a positioning mechanism provided on each of the first crank and the second crank, wherein the positioning mechanism comprises an abutting pin, aligned in a rotational direction of the first crank or the second crank, and a numerical display unit for displaying a position of the abutting pin.