Iris segmental atrophy is the result of a certain state of high intraocular pressure that impairs blood supply to the iris artery, causing ischemic segmental or fan-shaped atrophy consistent with the shape of the distribution of the iris artery. Iris segmental atrophy is a clinical manifestation of acute congestive glaucoma in remission. What are the symptoms that are easily confused with it? 1, optic nerve atrophy Optic nerve atrophy is not the name of a disease, but refers to a formative change in the retinal ganglion cells and their axons caused by any disease, resulting in a thinning of all the optic nerve, a common term for pathology, which generally occurs in the retina to the lateral geniculate body between the ganglion cells axonal degeneration. 2. Atrophy of the optic papilla on one side and edema on the other side This sign is usually seen in tumors or abscesses at the base of the frontal lobe of the brain, such as internal carotid artery aneurysms, olfactory groove meningiomas, meningiomas at the base of the skull in the anterior cranial sulcus, and craniopharyngiomas. Other conditions such as internal carotid artery spindle dilation, internal carotid artery sclerosis, trauma to the anterior cranial sulcus, and arachnoiditis of the anterior cranial sulcus can also cause atrophy of the optic papilla on one side and edema on the other side. As one side of the optic nerve is first atrophied by direct compression of the tumor, later on the tumor continues to grow and produces increased intracranial pressure, resulting in edema of the healthy side of the optic papilla. 3. Acute iridocyclitis and acute conjunctivitis The differential diagnosis has been introduced in general textbooks and is relatively easy, but it must be emphasized that there are contradictory aspects in the treatment of these three diseases. Therefore, a wrong diagnosis will lead to deterioration of the disease and even cause the possibility of blindness. 4. malignant glaucoma Since the clinical manifestations and ocular anatomical signs of primary malignant glaucoma and this disease have many similar aspects, it is easy to cause misdiagnosis. In addition, the differential diagnosis of the two diseases is very important because the principles of management are different and because misdiagnosis can cause serious damage. Malignant glaucoma is also characterized by narrowing of the anterior segment, but often the anterior segment is narrower, the lens is thicker, the eye axis is shorter, and the lens is more anteriorly positioned compared to this disease. Unlike this disease, the anterior chamber is shallow and the iris shows a consistent forward elevation in front of the lens, and most importantly, the condition worsens when treated with pupil reduction agents. 5, secondary glaucoma In addition to acute closed-angle glaucoma, blood shadow cell glaucoma, lens expansion, lens lysis, lens hemi-dislocation caused by glaucoma, neovascular glaucoma, secondary glaucoma caused by uveitis can cause an acute increase in intraocular pressure, even leaving signs of ocular damage caused by high intraocular pressure, in order to distinguish from the above cases, the most important of which is to make the contralateral eye For primary angle-closure glaucoma, both eyes often have the same anatomical features, and if the contralateral eye is not found to have the same features, further examination should be performed to make a differential diagnosis.