- Caused due to damage of nasal fibers at the optic chiasm
- Results in vision like the following image:

Bitemporal Hemianopsia

- Causes of binasal hemianopsia are very sporadic, but can be deduced that it is caused from damage of temporal fibers at optic chiasm
- Very rare; less than 10 instances in literature
- Following image shows how binasal hemianopsia affects vision:

Binasal Hemianopsia

- Bitemporal hemianopsia
- Binasal hemianopsia

University of Colorado at Boulder

- Loss of vision or blindness in half of one's visual field
- Most commonly is permanent; can occur temporarily due to migraines
- Two major types of permanent hemianopia: heteronymous and homonymous hemianopia
- The image below represents vision of an individual without any damage to their visual fields. Use this as a reference for heteronymous and homonymous hemianopia

Hemianopsia/Hemianopia

Peli, E., & Satgunam, P. N. (2014). Bitemporal hemianopia; its unique binocular complexities and a novel remedy. Ophthalmic and Physiological Optics, 34(2), 233–242. https://doi.org/10.1111/opo.12118 

Bitemporal hemianopia; its unique binocular complexities and a novel remedy

Tsokolas, G., Khan, H., Tyradellis, S., George, J., &amp; Lawden, M. (2020). Binasal congruous hemianopia secondary to functional visual loss. Medicine, 99(27). https://doi.org/10.1097/md.0000000000020754 

Binasal congruous hemianopia secondary to functional visual loss.

- Lesions in an optic tract, causing a loss of vision in the opposite visual field in both eyes (for example, a lesion in the right optic tract would result in loss of vision of the left visual field).
- Causes include schizencephaly, stroke, tumors, and other trauma to brain
- The following image represents vision of someone with left homonymous heminopsia


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