I am very sorry to hear about your vision issues. Damage to the retina and a dry (atrophic) optic nerve is typically irreversible, meaning there is no medicine to regrow these tissues. Your primary goal must be protecting the remaining vision in your left eye. You must consult a vitreoretinal specialist and a neuro-ophthalmologist immediately. Depending on the cause, they may prescribe pressure-lowering eye drops to protect the remaining nerve, recommend specialized antioxidant supplements, and manage underlying conditions like high blood pressure or diabetes. Please also ask about low-vision rehabilitation and optical aids to help maximize your remaining sight. Do not self-medicate.