Pressing a button on the head moves the microscope back to the original position. Two heads may be provided, for the surgeon and an assistant. Each head may be moved independently, and each head has separate adjustment for interocular distance and eye focus. A surgeon and an assistant may take virtually any position. A port is provided for photomicrography or video recording.
Illumination is by two fiber-optic light sources.
These may come from the sides, at any angle, or one may be focused through the objectives for vertical illumination. Thus illumination is either double, from the sides, or from the side and concentric. Magnifications range from 2.2x to 25x, depending on the unit. Working distances range from 20 to 45 cm., again depending on the unit and the objective add-on lens. Field of view ranges from 77 to 7 mm.