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In medical terminology, “primary angle closure” (PAC) refers to a structural condition in the eye where the drainage system becomes physically blocked by the iris, the colored part of the eye. The “angle” specifically designates the 360-degree anatomical junction located between the clear cornea and the iris, which contains a drainage sponge called the trabecular meshwork. When this channel narrows or seals off without an underlying disease causing it, it is classified as “primary”. The Clinical Spectrum

Primary angle closure is part of a progressive disease spectrum known as Primary Angle-Closure Disease (PACD), categorized into three primary stages: Lecture: Primary Angle Closure Glaucoma