Figure 3a. Vitreous fluid flows through a retinal tear to cause a partial retinal detachment involving the macula. The optic nerve and nasal retina, or portion of the retina closest to the nose, are normal and uninvolved. Vitrectomy surgery is indicated to restore vision. Image courtesy of the ©ASRS Retina Image Bank, contributed by Brandon Busbee, MD. Image 2939.