An embodiment of this disclosure provides an optical lens, which includes, in order from an object side to an image-forming side, a first lens with negative refraction power; a second lens with negative refraction power; a third lens with positive refraction power; a fourth lens with positive refraction power; and a fifth lens with negative refraction power; wherein the second lens has an Abbe number vd2, the fifth lens has a refractive index nd5, and 20≤vd2≤30 and nd5≥1.9.