A chalazion is a lump (cyst) in the eyelid. It is usually painless and may cause blurring of the vision if it becomes large enough. Blurring more commonly occurs from chalazia in the upper lid. The cyst is caused by a blockage of the gland in the tarsal plate, located at the back of the eyelid.
The chalazion may resolve spontaneously, without any treatment, but resolution is encourages by warm compresses, performed three times daily. However, in many cases, definitive treatment involves surgical drainage which is performed under local anaesthesia.Â