Lens assembly and lens module incorporating the same

A lens module comprising:

• a first lens comprising a first central portion, a first peripheral portion surrounding the first central portion and a stepped portion, the stepped portion having a first step upwardly extending from the first peripheral portion and a second step upwardly extending from the first step, the first step having an inner side surface, an outer side surface, and a top surface, the second step having a side surface adjoining the top surface of the first step;
• a second lens engaged with the first lens, the second lens comprising a second central portion, a second peripheral portion surrounding the second central portion and a protrusion extending downwardly from the second peripheral portion, the protrusion having an engaging surface and a bottom surface adjoining the engaging surfaces, the protrusion being engaged with the stepped portion in a manner that the bottom surface is in contact with the top surface of the first lens;
• and
• a barrel receiving the first lens and the second lens therein.