The Ocular 3 Mirror Universal is the classic Goldmann-type diagnostic contact lens, with three internal mirrors angled at 59°, 67°, and 73° for gonioscopy of the anterior chamber angle and examination of the peripheral fundus — while the central lens views the posterior pole. This is the 18 mm contact-diameter version (OG3M), a versatile everyday lens for glaucoma and retina slit-lamp work. Order today.