Blurred afterglow in the eyes indicates a problem with peripheral vision, or visual field, and the visual field defect that occurs is or a decrease in visual acuity. It may be caused by retinitis pigmentosa, glaucomatous optic nerve damage; it may also be caused by blurred afterglow after using certain medications that cause pupil narrowing or after wearing convex lenses; and fundus diseases, such as optic papilledema, arcuate spots around the optic disc in highly myopic eyes, and congenital abnormalities of the optic nerve papillae, may also cause blurred afterglow. Severe diseases may be ischemic retinal optic neuropathy, retinal choroidal inflammation, retinal vascular obstruction, or retinal detachment, optic neuritis, or intracranial lesions that cause visual field defects.