Optical lens

The invention discloses an optical lens, which comprises a positive diopter plastic aspheric surface first lens, a plastic aspheric surface second lens, a plastic aspheric surface third lens and a positive diopter plastic aspheric surface fourth lens which are sequentially arranged from an object side to an image side, and the first lens and the fourth lens are the outermost lenses at the two ends of the optical lens. The number of the lenses with diopters of the optical lens is less than 9, each lens is a single lens, and the length between the optical centers of the surfaces of the lenses at the two outermost ends is 50-130 mm. 本发明公开了一种光学镜头，包括由物侧至像侧依序排列的正屈光度塑胶非球面第一透镜、塑胶非球面第二透镜、塑胶非球面第三透镜，及正屈光度塑胶非球面第四透镜，且第一透镜与第四透镜为光学镜头两端最外侧的透镜。光学镜头具有屈光度的透镜数目少于9片，各个透镜均为单镜片，且最外侧两端透镜表面各自的光学中心之间的长度介于50-130mm。