Guardion Health Sciences, Inc., together with its subsidiaries, operates as a specialty health sciences company in the United States. It operates in two segments, Medical Foods and Medical Devices. The Medical Foods segment offers Lumega-Z, a medical food that replenishes and restores the macular protective pigment; and GlaucoCetin, a vision-specific medical food to support and protect the mitochondrial function of optic nerve cells, as well as improve blood flow in the ophthalmic artery in patients with glaucoma. The Medical Devices segment offers VectorVision, which develops, manufactures, and sells equipment and supplies for standardized vision testing for use by eye doctors in clinical trials, real-world vision evaluation, and industrial vision testing; CSV-1000, an instrument for contrast sensitivity, glare sensitivity, low contrast acuity, and early treatment diabetic retinopathy; CSV-2000, a digital standardized contrast sensitivity testing device; and MapcatSF, a medical device that measures the macular pigment optical density. The company distributes its products through sales force, as well as through its guardionhealth.com Website. Guardion Health Sciences, Inc. was founded in 2009 and is headquartered in San Diego, California.