Definition Surgeries to correct changes in the eyelids and forehead area that are secondary to aging and manifest by redundancy and displacement of tissues. The most important procedures include upper and lower eyelid blepharoplasty and brow elevation. Key Features Facial…
Definition The tear drainage system of the eye consists of the lacrimal puncta, canaliculi, lacrimal sac, and nasolacrimal duct. It serves to transport tears from the eye and conjunctival sac to the nose. The eyelids also form an important component…
Definition The orbit is the bony cavity that contains the eye, eye muscles, lacrimal gland, and other structures that serve eye functions. Numerous diseases affect the orbit and can involve any of these tissues, including neural, muscular, vascular, lymphatic, and…
Definitions Computed tomography: An imaging technique where contrast differences are based on tissue density based on the passage of X-rays through tissues. Magnetic resonance imaging: An imaging technique where density differences are based on tissue proton density and their resonance…
Definition The orbit is the anatomical space bounded by seven orbital bones and enclosed within the multilamellar periorbita. It is separated above from the intracranial compartment and medially and inferiorly from the paranasal sinuses. The orbit contains the eye and…
Definition The eyelids are mobile, flexible, multilamellar structures that cover the globe anteriorly. They protect the ocular surface, spread the precorneal tear film, and help propel tears into the lacrimal drainage system. Anatomically, the eyelids are composed of an anterior…