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The brain is constituted by a preponderance of microglia and astrocytes, these glial cells are essential in the Central Nervous System (CNS), with microglia functioning as innate immune cells involved in surveillance and defense, while astrocytes modulate neuronal communication, maintain the extracellular environment, and regulate inflammatory signaling (Garland et al., 2022) Both brain cells are able to produce pro- and anti-inflammatory cytokines (Schwarz and Bilbo, 2012)

doi:10.1155/2016/8158693 18 van den Dolder PA, Ferreira PH, Refshauge KM

Journal of Chromatography B

Realistic timelines: Vision changes requiring professional evaluation include sudden vision loss, new floaters or flashes, curtain or shadow in vision, severe pain, double vision