Contributor. Gordon K. Klintworth
Glaucoma may develop in a person without an apparent antecedent underlying ocular disease [glaucoma - primary], or it may follow or occur concomitantly with a known ocular disorder [glaucoma - secondary]. Primary and secondary glaucomas are subdivided into open-angle [glaucoma - primary open angle, glaucoma - secondary open angle] and closed-angle types [glaucoma - primary closed angle, glaucoma - secondary closed angle] depending on whether the iridocorneal angle appears open or closed. Glaucoma can also be subdivided into congenital [glaucoma - congenital], or acquired types depending on the time of onset. Glaucoma may be a manifestation of an inherited syndrome, such as Lowe syndrome and the nail-patella syndrome.