The present disclosure provides a lens. The lens includes at least two layers of glass wafers, each glass wafer is provided with a lens array including a plurality of lens units, glue is provided around a periphery of each of the lens unit, the lens units of two adjacent layers of glass wafers are correspondingly arranged one to one, and are adhered via the glue, the glass wafer is further provided with an air hole. In the lens provided by the present disclosure, through providing an air hole on the glass wafer of the lens, so that when two adjacent glass wafers are stacked via the glue, air in the sealed space can be exhausted through the air hole, and through filling glue in the air hole of the outermost layer of glass wafer, the sealing effect is achieved, which can avoid packaging defects, and improve product yield.