Optical member production method and optical member

An optical member, comprising:

• a first layer and a second layer, wherein:
• an average thickness of the second layer is greater than an average thickness of the first layer,
• the first layer contains at least one selected from the group consisting of a photochromic compound, an alcohol compound, and a visible light-absorbing dye, and
• the optical member has a prism difference of 0.25 mm or less, and no stria having a length of 1.0 mm or more is present in a region within a radius of 15 mm from a center of the optical member.

A method of producing an optical member, comprising:

• bonding a film to outer peripheral faces of a pair of mold substrates that are arranged to face each other with a predetermined spacing therebetween, thereby forming a space enclosed by the pair of mold substrates and the film;
• injecting a polymerizable composition into the space;
• and
• curing the polymerizable composition injected into the space, thereby obtaining a cured material,
• wherein a ratio of a heat-resistance index of the film measured under conditions of 30° C. and 30 minutes to a heat-resistance index of the film measured under conditions of 20° C. and 30 minutes is more than 0.1, and a degree of polymerization of the polymerizable composition is 15% or more if the curing is carried out at 30° C.