Abstract: The light detector includes: a substrate including at least one light receiving area and a light incident surface on which light is incident; and a meta-lens formed on the light incident surface of the substrate to focus the light incident on the light incident surface. When viewed from the thickness direction (Z-axis direction) of the substrate, the meta-lens is formed so as to overlap both an adjacent region adjacent to the light receiving area and a peripheral region that is continuous with the adjacent region and is a region inside the light receiving area along the outer edge of the light receiving area. When viewed from the Z-axis direction, a non-forming region in which the meta-lens is not formed is provided in a region overlapping a central region of the light receiving area in the light incident surface.

Abstract: The present invention provides novel methods of preventing or treating peripheral neuropathies, and of preventing or treating pain symptoms associated with diseases having peripheral neuropathies or astrocytic damages, and provides an agent for preventing or treating peripheral neuropathies or pain symptoms associated with diseases having peripheral neuropathies or astrocytic damages, which agent contains an RGM inhibiting substance.