**Hemianopsia** are pathological conditions of the visual system in which half the visual field of one or both eyes is affected. If the lesions are unilateral, the condition is called contralateral hemianopsia. Most often, hemianopia is detected only in the presence of another ophthalmological disease - cataracts or glaucoma, various retinal dystrophies.
Double hemianopia gives clear vision of only half of the light field. Hemianopia is often bilateral, in the form of two lesions (DLD), but combined optical lesions can also occur - heterogeneous, with vascular disorders in the left and right eyes occurring simultaneously. This option is called “double” (heterogeneous) amblyopia. **Often the cause of double hemianopia is:** * cataract; * optic neuritis;
* retinal angiopathy; * optic nerve atrophy. In such a situation, it is important not only to identify the cause, but also to find all the associated links in the pathogenesis of eye disorders. The cause must be eliminated or its impact minimized, then vision can be restored completely, the function of the eye can be preserved and restored as much as possible. Sometimes, along with a focal lesion, there are foci of uneven impact on different areas of the eye, which can also be manifested by the presence of amblyopia. Double hemianopia often affects a group of people whose professional activities involve processing information. For example, miners and urban public transport drivers need to have good peripheral vision; they have a double focus. The professions of librarian, musician and seamstress are no exception, those who are specifically entrusted with the task of assembling structures. It is worth noting that GDR is often discovered after head concussions or traumatic brain injuries. However, the causes of visual field defects may be much less obvious (whether due to injury or biological prerequisites), and the specific symptoms of an altered field depend on how large the margin of their deviation is. Complications of doubles and single “distortions” arise as a result of prolonged failure to take appropriate measures to eliminate them, so the patient must not only undergo a timely examination, but also follow the doctor’s recommendations