Preeclampsia: This condition is a leading cause of visual disturbances in pregnancy, including visual field changes, due to its effects on the vascular system and potential for causing posterior reversible encephalopathy syndrome (PRES).

Migraines: Migraines are common in pregnancy and can cause transient visual field defects, including scintillating scotomas and homonymous hemianopia.
Pituitary Adenoma: Pituitary adenomas can expand during pregnancy due to hormonal changes, potentially causing chiasmal compression and leading to bitemporal hemianopia.
Diabetic Retinopathy: Pregnant women with pre-existing diabetes are at risk of worsening diabetic retinopathy, which can lead to visual field changes.

Stroke: Although less common, stroke is a critical diagnosis that must not be missed. Visual field defects can be a presenting symptom of a stroke, and timely intervention is crucial.
Brain Tumors: Other brain tumors, aside from pituitary adenomas, can cause visual field changes by compressing or invading the visual pathways.
Venous Sinus Thrombosis: This condition can cause increased intracranial pressure and lead to visual field changes, including papilledema.

Choriocarcinoma Metastasis: Rarely, choriocarcinoma, a type of gestational trophoblastic disease, can metastasize to the brain and cause visual field defects.
Cavernous Sinus Thrombosis: This is a rare condition that can lead to visual field changes among other symptoms, due to its location and potential to affect multiple cranial nerves.
Idiopathic Intracranial Hypertension (IIH): Also known as pseudotumor cerebri, IIH can cause visual field changes, including peripheral field loss and can be associated with pregnancy.