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  Ocular Surgery is medical surgery performed upon the eye or its posterior adnexa, usually by a specialist ophthalmologist. The eye is such a delicate organ and needs utmost care prior to, during, and immediately after a surgical procedure. A qualified ophthalmologist will take into consideration a variety of factors before performing any surgical procedures, especially if the procedure will require the use of an ocular laser or an ocular implant. An ocular surgeon who is well-trained will perform an initial examination, order tests, and review images. This surgery can be divided into two types: open surgery (UV) and closed surgery (COS). Open ocular surgery is the type of ocular surgery that occurs when the surgeon removes a blemish such as a cataract; COS surgery is the removal of a venous clot. These blemishes are typically caused by trauma to the eye, such as in the case of cataracts. Blepharospasm or tearing can also cause tears to occur, as in the case of vitreoretinal tears.