A simulated eye includes a semi-spherical eyeball with a light-transmitting area, a light source, a light transmitting board, and a photochromic layer. The light transmitting board disposed between the eyeball and the light source faces the light-transmitting area. The light transmitting board includes a first portion and a second portion surrounding the first position. The first portion is in a first color. The second portion is in a second color other than the first color. The photochromic layer is formed by photochromic materials coated on a side of the second portion facing the light source. When the light source is turned on, the emitted light irradiates the photochromic layer, whereby an area of the second portion covered by the photochromic layer changes from the second color to a third color similar to or the same as the first color.