Ophthalmic Supplies - Slit Lamp Z Stepper Magnification is consisting of a high intensity light source that can be focused to shine as a slit. It is used in conjunction with a bimicroscope. The lamp facilitates an examination which looks at anterior segment, or frontal structures and posterior segment, of the human eye, which includes the eyelid, sclera, conjunctiva, iris, natural crystalline lens, and cornea.