Investigation of the geometric and optical quality of polymer lenses in the injection molding process is costly and time-consuming. So, looking forward to reducing the cost of iection, while ensuring the optical quality of the lenses after production is consider in this study. The geometric quality of bi-convex and bi-concave spherical lenses and comparing the trend of the pressure and temperature graph of the mold cavity to the optimum geometric mode as reference trend and the maximum geometric deviation is evaluated. Regarding the priority of the effect of the geometric parameters, average volumetric shrinkage and warpage are the best parameters for consideration. The results show that the most important effective injection molding process parameters in lens molding are packing time, packing pressure, melt temperature and mold temperature. According to the experimental results, the average amounts of PV for the two surfaces of the bi-convex lens in the optimum level are 7.7? and 7.9? and for the bi-concave lens are 8.8 ? and 8.1 ?. In addition, the geometric quality of a lens is better when the trend of slope of the pressure graph is lowered to zero and should not be reduced suddenly for all three sensors locations. Keywords Average volumetric shrinkage, Warpage, Spherical lens, Injection molding, Peak to valley, Mold cavity pressure-temperature
