A fine and well-preserved antique lens thickness gauge, most likely dating from the mid-20th century. This precision instrument was an essential tool of the optical workshop, used by opticians and lens makers to measure the center and edge thickness of ophthalmic lenses with great accuracy — a critical step in ensuring that finished spectacle lenses met the exacting optical and cosmetic standards required for correct vision correction.
The gauge features a large, clearly calibrated dial face with fine graduations, mounted on a sturdy brass calipered frame with curved measuring arms that cradle the lens during measurement. The dial indicator design allowed the optician to obtain a precise and repeatable reading quickly and reliably, making it far more efficient than earlier mechanical gauges. The same fundamental style of lens thickness gauge proved so effective that it remained in common use throughout the optical trade and is still available for purchase today — a testament to the soundness of its design.
A practical and attractive piece of mid-century optical workshop history, appealing equally to collectors of antique optician’s tools and those with an interest in the history of precision measurement instruments.
