This paper presents the influence of the additive composition on flexural strength and hardness of SiC-TiC composites materials for spectacle lens cutting materials. The materials were hot-pressed at $1800^{circ}C$ and subsequently annealed at $1910^{circ}C$ for 3h. The heating rate was $15^{circ}C/min$ and the cooling rate about $25^{circ}C/min$ in from the sintering temperature to $1300^{circ}C$. The growth of particles of spectacle lens cutting materials was analysed by SEM and crystalline phases were discussed by x-ray diffractometry. Typical fracture toughness and hardness of materials for spectacle lens cutting were $6.1MPa{cdot}m^{1/2}$ and 14.9 GPa, respectively.