Method of producing an optical material and optical material

A method of producing an optical material, wherein a polymerizable composition intended to polymerize to form the optical material comprises:

• a) monomeric compounds adapted to polymerize, said monomeric compounds include acrylic monomeric compounds adapted to polymerize to form an acrylic substrate or allylic monomeric compounds adapted to polymerize to form an allylic substrate;
• b) from 20,000 ppm to 35,000 ppm of at least one catalyst for initiating the polymerization of said monomeric compounds as compared to the total weight of the polymerizable composition;
• and
• c) from more than 1,500 ppm to 3,000 ppm of a release agent, as compared to the total weight of the polymerizable composition;
• wherein said polymerizable composition is polymerized under a polymerization cycle including a plurality of steps, the global duration of the polymerization cycle being of less than 17 hours and of at least 15 hours;
• and
• wherein the polymerization cycle includes the following steps:
• heating for a duration of less than 7 hours from about 25°° C. to about 40° C.,
• increasing the temperature from 40° C. to about 85° C. during 7 to 10 hours at a speed ranging from about 5°° C./hour to 9° C./hour, and
• cooling for 3 hours from 85° C. to about 75° C.