| abstract |
An optical material, comprising a resin composed of a polymer constituted of 10 of 95 mol %, based on the polymer, of a first structural unit represented by the formula (I) and 90 to 5 mol %, based on the polymer, of a second structural unit represented by the formula (II), and having a weight-average molecular weight of from 1 x 10 3 to 5 x 10 6 in polystyrene equivalent:n n The optical material has a Tg value not less than 120°C, a light transmittance value not less than 85 %, and a pencil hardness not lower than H. |