Narrow or occludable angle (primary angle closure suspect: PACS) is the abnormality of the positioning of iris that close the angle. In the eye there is a circulation of the fluid called aqueous humor. The aqueous humor is produced by the ciliary body. When aqueous humor is produced it is first released into the posterior chamber before flowing through a cleft between the iris and lens and then flow into the anterior chamber. After that the aqueous humor will drain out via a small drainage system at the angle of the eye called trabecular meshwork and be absorbed into the veins. The narrow or occludable angle is when the angle of the eye is narrow or closed by the iris. It can run in the family and is frequently found in some ethnic groups such as Asian.