A monomer for an optical component includes: a compound represented by the formula (1), in which a pH obtained through a pH measurement method below is 4.0 to 7.5.

(pH Measurement Method)
80 g of a sample, 80 mL of toluene, and 250 mL of water are mixed together in a liquid separation funnel, an aqueous phase is separated off, and the pH of the aqueous phase is measured.

##STR00001##

A monomer for an optical component includes: a compound represented by the formula (1), in which a pH obtained through a pH measurement method below is 4.0 to 7.5.

(pH Measurement Method)
80 g of a sample, 80 mL of toluene, and 250 mL of water are mixed together in a liquid separation funnel, an aqueous phase is separated off, and the pH of the aqueous phase is measured.

##STR00001##

According to one preferred embodiment of the present invention, a composition for optical materials, which contains a compound represented by formula (1) and a compound represented by formula (2), is able to be provided. This composition for optical materials enables stable storage of a compound represented by formula (2) at low cost, and also enables stable storage thereof with respect to temperature change. In addition, this composition for optical materials enables the achievement of an optical material which has good light resistance.

##STR00001##

(In formula (1), in represents an integer of 0-4; and n represents an integer of 0-2.)

##STR00002##

(In formula (2), m represents an integer of 0-4; and n represents an integer of 0-2.)

According to one preferred embodiment of the present invention, a composition for optical materials, which contains a compound represented by formula (1) and a compound represented by formula (2), is able to be provided. This composition for optical materials enables stable storage of a compound represented by formula (2) at low cost, and also enables stable storage thereof with respect to temperature change. In addition, this composition for optical materials enables the achievement of an optical material which has good light resistance.

##STR00001##

(In formula (1), in represents an integer of 0-4; and n represents an integer of 0-2.)

##STR00002##

(In formula (2), m represents an integer of 0-4; and n represents an integer of 0-2.)

According to the present invention, it is possible to provide an optical material composition that contains an episulfide compound represented by formula (1) and an episulfide compound represented by formula (2). According to this optical material composition, it is possible to suppress a reduction in the yield rate caused by molding defects, and possible to obtain an optical material having excellent dyeability. ##STR00001##
(In formula (1), m and p are each an integer between 0 and 4, and n and q are each an integer between 0 and 2.) ##STR00002##
(In formula (2), m is an integer between 0 and 4 and n is an integer between 0 and 2).

According to the present invention, it is possible to provide an optical material composition that contains an episulfide compound represented by formula (1) and an episulfide compound represented by formula (2). According to this optical material composition, it is possible to suppress a reduction in the yield rate caused by molding defects, and possible to obtain an optical material having excellent dyeability. ##STR00001##
(In formula (1), m and p are each an integer between 0 and 4, and n and q are each an integer between 0 and 2.) ##STR00002##
(In formula (2), m is an integer between 0 and 4 and n is an integer between 0 and 2).

The invention provides compounds, compositions, and methods for the treatment of diseases, disorders, or conditions that are modulated by matrix metalloproteinases (MMPs). The compounds can be selective MMP inhibitors, for example, selective inhibitors of MMP-2, MMP-9, and/or MMP-14. The disease, disorder, or condition can include, for example, stroke, neurological disorders, ophthalmological disorders, or wounds, such as chronic wounds or diabetic wounds.

The invention provides compounds, compositions, and methods for the treatment of diseases, disorders, or conditions that are modulated by matrix metalloproteinases (MMPs). The compounds can be selective MMP inhibitors, for example, selective inhibitors of MMP-2, MMP-9, and/or MMP-14. The disease, disorder, or condition can include, for example, stroke, neurological disorders, ophthalmological disorders, or wounds, such as chronic wounds or diabetic wounds.

According to the present invention, it is possible to provide a polythiol composition, which comprises a polythiol (A) represented by formula (1) and a thiol compound (B) represented by formula (2). ##STR00001##
(In formula (1), p and q each independently represent an integer of 1 to 3.) ##STR00002##
(In formula (2), p and q each independently represent an integer of 1 to 3.)

The present invention inhibits the clouding of cured products obtained by polymerizing and curing a composition including sulfur and an episulfide compound, and inhibits clouding particularly in lenses, called plus-power lenses, that have large central thicknesses; and provides a composition for optical materials with which it is possible to predict and assess whether or not clouding will occur after curing and to determine quality at a stage before polymerization and curing. These objectives are achieved by, for example, a composition for optical materials that includes: sulfur, the turbidity value of which when made into a 30-mass % carbon disulfide solution is 10 ppm or less; and an episulfide compound. That is, clouding is prevented and excellent transparency is achieved in optical materials produced from said composition for optical materials that comprises an episulfide compound and sulfur that satisfies the aforementioned condition in terms of turbidity value.