Pre-eclampsia/HELLP Syndrome: This condition is a leading cause of maternal morbidity and mortality, especially in the postpartum period. It can cause acute kidney injury (AKI), seizures (eclampsia), and visual disturbances due to cerebral edema or retinal detachment. The recent history of LSCS (Lower Segment Cesarean Section) and the combination of AKI, seizure, and decreased vision make this a highly plausible diagnosis.

Postpartum Hemorrhage (PPH) leading to Hypovolemic Shock: Although less directly linked to seizures and visual disturbances, severe PPH can lead to multi-organ dysfunction, including AKI. In rare cases, hypovolemic shock can cause decreased perfusion to the brain and eyes, potentially leading to seizures and visual disturbances.
Infection (Sepsis): Postoperative infections can lead to sepsis, which may cause AKI, seizures (due to septic encephalopathy), and decreased vision (due to septic shock affecting ocular perfusion). The post-surgical state increases the risk of infection.
Thrombotic Thrombocytopenic Purpura (TTP) or Hemolytic Uremic Syndrome (HUS): These conditions can cause AKI, neurological symptoms (including seizures), and visual disturbances. They are less common but should be considered in the differential diagnosis due to their severity.

Cortical Vein Thrombosis: This is a rare but potentially life-threatening condition that can cause seizures and visual disturbances. It is more common in the postpartum period due to hypercoagulability. Missing this diagnosis could lead to significant morbidity or mortality.
Pituitary Apoplexy: Although rare, this condition can occur postpartum and cause sudden visual loss, headache, and potentially seizures due to the mass effect on surrounding structures. It requires urgent diagnosis and treatment.
Meningitis or Encephalitis: Infections of the central nervous system can cause seizures and visual disturbances. In a postpartum patient with AKI, these diagnoses are critical to consider due to their potential for severe outcomes if not promptly treated.

Reversible Cerebral Vasoconstriction Syndrome (RCVS): This condition can cause seizures and visual disturbances due to transient cerebral vasoconstriction. It is rare and often associated with postpartum or migraine headaches.
Posterior Reversible Encephalopathy Syndrome (PRES): Characterized by headache, seizures, visual disturbances, and AKI, PRES is a rare condition that can occur in the postpartum period, especially in the context of pre-eclampsia or eclampsia. It is reversible with appropriate management.