NOVELTY - The optical film comprises a transparent substrate layer, a nanosilver wire pattern layer that is formed on one surface of the transparent base layer, a light diffusion layer that is formed on the other surface of the transparent base layer, where half width of the nanowire pattern layer and the light diffusion layer is represented by specific equation as specified in the specification. The thickness of the transparent base layer is 5-100 mu m. The nanosilver wire pattern layer is formed by mixing binder resin with a nanosilver wire.    USE - The optical film is useful in a plasma display panel, an optical filter, an electromagnetic wave shielding agent, an organic LED (OLED), a solar cell, an LCD, a touch screen, and electroluminescent keypad for a cellular phone.    ADVANTAGE - The optical film has improved light diffusion properties.    DETAILED DESCRIPTION - The optical film comprises a transparent substrate layer, a nanosilver wire pattern layer that is formed on a surface of the transparent base layer, a light diffusion layer that is formed on the other surface of the transparent base layer, where half width of the nanowire pattern layer and the light diffusion layer is represented by specific equation as specified in the specification. The thickness of the transparent base layer is 5-100 mu m. The nanosilver wire pattern layer is formed by mixing binder resin with a nanosilver wire. The nanosilver wire has average length of 0.1-10 mu m, and average diameter of 1-100 nm. The thickness of the nanosilver wire pattern layer is 0.1-10 mu m. The binder resin in the light diffusing layer is compounded with a light-diffusing agent particle. The refractive index difference of the binder resin and the light-diffusing agent particle is plus minus 0.1. The diameter of the light-diffusing agent particle is 1-2 nm. The binder resin contains 0.001-10 pts. wt. of light-diffusing agent particle, and includes membranous polymers having visible transmittance of greater than 85%. The thickness of the light diffusing layer is 0.1-10 mu m.