The modern upper blepharoplasty relies on removal of excess skin, occasionally obicularis muscle, and rarely fat. Below the upper eyelid muscle and orbital septum, there are 3 compartments - lateral, middle, and medial (closest to the nose). The lateral compartment contains the lacrimal gland, the middle contains a yellowish colored fat pad, and the medial contains a whiter colored fat pad. In the past, many eyelid surgeons removed too much orbital fat. I've seen hundreds of these patients who have that "sunken-in" deep upper orbital sulcus or the so called "A-frame deformity" - which is not aesthetic. This deformity can be corrected with fat grafting or a safe filler. If I remove upper orbital fat, it is usually a small amount from the compartment closest to the nose. I rarely remove fat from the middle compartment and never disturb the lacrimal gland. The lacrimal glands provide tear lubrication for the eyes, thus removal or partial removal can cause a dry eye. Your Plastic Surgeon should ask you before eyelid surgery if you have a history of dry eyes. If your Plastic Surgeon suspects you have dry eyes, he can perform a simple test on both eyes called a Schirmer's Test. This test involves placing a small strip of filter paper under your lower lid and measuring the length of the wetness. A normal test is greater than 10 mm of moisture on the filter paper after 5 minutes.