The lateral sulcus separates the frontal lobe from the temporal lobe. The frontal lobe can be divided into a lateral, polar, orbital (above the orbit; also called basal or ventral), and medial part. Each of these parts consists of a particular gyrus: 1  Lateral part: lateral part of the superior frontal gyrus, middle frontal gyrus, inferior frontal gyrus. 2  Polar part: Transverse frontopolar gyri, frontomarginal gyrus. 3  Orbital part: Lateral orbital gyrus, anterior orbital gyrus, posterior orbital gyrus, medial orbital gyrus, gyrus rectus.
Less common causes of glaucoma include a blunt or chemical injury to the eye, severe eye infection, blockage of blood vessels in the eye, inflammatory conditions of the eye, and occasionally eye surgery to correct another condition.
1 Like POAG, normal-tension glaucoma (also called normal-pressure glaucoma, low-tension glaucoma or low-pressure glaucoma) is a type of open-angle glaucoma that can cause visual field loss due to optic nerve damage. 2  But in normal-tension glaucoma, the eye's IOP remains in the normal range. The cause of normal-tension glaucoma is not known. 2  But many doctors believe it is related to poor blood flow to the optic nerve. 3  Normal-tension glaucoma is more common in those who are Japanese, are female and/or have a history of vascular disease.