Curable organopolysiloxane composition, and optical member formed from cured product of same

A curable organopolysiloxane composition, comprising the following components A) to C) and a curing catalyst to accelerate a curing reaction involving reactive groups of components A) and C):

• A) an organopolysiloxane component;
• B) one or more inorganic fillers selected from the group consisting of spherical silica particles, spherical alumina parts, and fluorescent fillers;
• C) an organosilicon compound represented by the following formula:
• Vi(CH3)2Si—(OSi(CH3)2)n1—OSi(OCH3)3
• wherein Vi represents a vinyl group and n1 is 1 to 50;
• wherein the mass of component B) is 30 to 95% relative to the mass of the overall composition;
• and
• wherein component A) comprises the following components A1) and A2):
• A1) a straight chain or branched chain organopolysiloxane, which is different from component A2);
• A2) an organopolysiloxane having a resin linear structure and comprising i) to iii) as follows:
• i) T units represented by RArSiO3/2, where RAr represents an aryl group having 6 to 14 carbon atoms;
• ii) a resin structure block having R72SiO3/2 units, where R72 represents a radical reactive group or a hydrosilylation reactive group;
• iii) a straight chain diorganopolysiloxane structure part represented by (R712SiO2/2)n2, where each R71 is an alkyl group having 1 to 20 carbon atoms, which may be substituted with halogen atoms, or an aryl group having 6 to 14 carbon atoms, which may be substituted with halogen atoms, and n2 represents a number within a range of 3 to 1000;
• wherein the reactive groups are capable of crosslinking via a radical reaction and/or a hydrosilylation reaction and the proportion of aryl groups having 6 to 14 carbon atoms in the total number of moles of RAr, R71 and R72 groups, but excluding hydroxyl groups, is 10 mol % or more.