The single optical fiber conducts light from a light source, illuminates the retina and at the same time the device provides a uniform intraocular pressure in the eye for panoramic vitreretinal surgery.

Often, in the case of retinal surgery (vitrectomy surgery) it is desired that the light source be within the eyeball in the form of an internal light. This permits the direct light of the operating microscope to be turned off and reduces glare at the cornea and corneal contact lens surfaces.
The light probe at its tip is shaped like a bullet, for diffused wide-angle illumination (also termed a "Bullet light"). That distal end may be moved further inward toward the rear of the eyeball, or withdrawn, during the operation.
The portions in contact with the patient's body fluids may be replaced and the remainder of the system may be sterilized, or the entire system may be disposable.
Cannula is available through Alcon.