H46-H48: Disorders of optic nerve and visual pathways
H48: Disorders of optic [2nd] nerve and visual pathways in diseases classified elsewhere
The term "disorders of optic (2nd) nerve and visual pathways in diseases classified elsewhere" refers to a range of conditions that affect the optic nerve, which is the structure that transmits signals from your eye to your brain, and the visual pathways, which are the network of neurons that process and interpret these signals. These conditions occur as a result of other diseases. For example, an inflammatory disease might cause swelling that presses on the optic nerve while a circulatory condition might restrict the nerve's blood supply. Symptoms typically depend on the part of the nerve or pathway affected and can include blurred vision, loss of color vision, and field vision impairment. Disease progression is also variable and depends on the underlying condition and its treatment. These diseases can often lead to serious consequences such as loss of sight if not properly managed.
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