%0 Review %T Chiasmal Compression by the Third Ventricle in Obstructive Hydrocephalus: Case Report and Review of the Literature. %A Guniganti R %A Kiser K %A Goyal M %A Reynolds MM %A Van Stavern GP %J J Pediatr Ophthalmol Strabismus %V 60 %N 5 %D 2023 Sep-Oct %M 37747160 %F 1.33 %R 10.3928/01913913-20230719-01 %X The authors review the phenomenon of third ventricular dilation causing chiasmal compression and vision loss, emphasize the need for further study given continued poor outcomes, and, in a patient case, illustrate the value of obtaining magnetic resonance imaging and nerve and macular optical coherence tomography in a patient with an unclear mechanism of vision loss. [J Pediatr Ophthalmol Strabismus. 2023;60(5):e49-e54.].