This research demonstrates that polysaccharides extracted from Ganoderma lucidum mushrooms can protect rat retinas from damage caused by blocked and then restored blood flow. The treatment reduced cell death, decreased harmful oxidative stress, reduced inflammation-like responses from support cells, and improved retinal electrical function. These findings suggest that Ganoderma lucidum could potentially be developed as a therapeutic option for eye diseases like glaucoma and diabetic retinopathy where blood flow to the retina is compromised.