Lens and lens module having the same

A lens module, comprising:

• a first lens, a second lens, and a third lens sequentially disposed from an object side to an imaging side;
• and
• a lens barrel configured to accommodate the first lens, the second lens, and the third lens,
• wherein the first lens comprises a lens unit having a refractive power, a flange portion disposed at an edge of the lens unit, and protrusions disposed on the flange portion at a first interval (G) in a circumferential direction and configured to form a passage connecting an object-side space and/or an image-side space of the lens unit and an outer space of the flange portion,
• wherein the lens barrel comprises a discharge path connected to the passage and configured to discharged a high temperature and high humidity air formed between the first lens and the second lens, and
• wherein 0.06 < APsum/AL < 0.1, where APsum is a sum of cross-sectional areas of the protrusions, and AL is a cross-sectional area of the first lens.