This is a Volk Optical gonioscopy lens, made in the USA.

Here's what the markings tell us:

What it is: A gonio lens (goniolens) used in ophthalmology. It's placed on the patient's cornea (with a coupling gel) and used with a slit lamp biomicroscope to visualize the iridocorneal (drainage) angle of the eye - the area where aqueous humor drains out. This is essential for diagnosing and managing glaucoma.

Based on its compact tapered single-element design and matte black anodized aluminum housing, it appears to be a Volk G-1 Gonio Lens (model VG1 or VG1NF - no flange version). The small teal/blue ring at the contact base is characteristic of Volk's gonio line.

The stainless steel bowl visible in the background is likely a soaking/sterilization container used for these contact lenses between patients.