What is a non-traumatic cause of acute binocular loss of vision?

Optic or retrobulbar neuritis is a non-traumatic cause of acute binocular loss of vision and is often associated with conditions such as multiple sclerosis or infections. This condition occurs due to inflammation of the optic nerve, which can lead to vision loss that is typically sudden and can affect one or both eyes. Patients may experience symptoms such as pain with eye movement and changes in color vision in addition to loss of visual acuity, making it identifiable as a neurological issue rather than a direct result of trauma.

The other options listed are related to traumatic events or injuries. An orbital blow-out fracture involves trauma resulting in a fracture in the bones surrounding the eye, which can disrupt vision due to physical damage to the structures. Hyphema refers to blood in the anterior chamber of the eye, often caused by trauma or injury, and can lead to visual impairment. A traumatic cataract develops as a result of eye injury, ultimately leading to opacity of the lens and vision loss. Hence, these options reflect conditions stemming from trauma rather than a non-traumatic process like optic neuritis.