Lens module and optical module incorporating the same

An optical module comprising:

• a first lens comprising a first central round portion, a first peripheral portion, the first peripheral portion having a first radially extending portion surrounding the first central round portion, and a first axially extending portion extending from the first radially extending portion, the first radially extending portion having a plurality of through holes defined therein;
• a second lens comprising a second central round portion optically aligned with the first central round portion of the first lens, a second peripheral having a second radially extending portion surrounding the second central round portion, and a second axially extending portion extending from the second radially extending portion, the second axially extending portion fittingly engaged in the first axially extending portion, the second axially extending portion and the first lens cooperatively defining an inner space, the through holes in communication with the inner space;
• and
• a barrel accommodating the first lens and the second lens therein.