Geneva Lens Measure Value Guide

The Geneva Lens Measure is a hallmark of early 20th-century optometry, prized by collectors for its intricate Swiss engineering and nickel-plated brass construction. Patented by the Geneva Optical Company, this high-precision instrument revolutionized the industry by using a three-probe system to accurately calculate the dioptric power of lens surfaces.

What Is Geneva Lens Measure Worth?

The typical price range for Geneva Lens Measure is $60 - $66 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• Mechanical functionality, specifically the smooth movement of the center probe and the accuracy of the needle return.
• The condition of the nickel plating, as excessive brassing or corrosion can decrease the value from the $66 peak.
• Clarity and integrity of the glass face, with cracked or heavily scratched covers reducing collector interest.
• Presence of the original protective case or historical documentation from the Geneva Optical Company.

How to Identify Geneva Lens Measure?

• Verify the presence of three pointed probes, ensuring the center probe moves freely to engage the internal gearing.
• Look for the Geneva Optical Company branding and Swiss origin marks typically engraved on the dial face or housing.
• Check for the specific material composition of nickel-plated brass and a glass-covered circular scale.
• Confirm the era by matching the aesthetic design and patent markings to the 1910-1930 production period.

History of Geneva Lens Measure

First patented in the late 19th century by the Geneva Optical Company, this device revolutionized optometry by allowing for quick and accurate readings of lens curvature. It uses three pointed probes, where the center probe moves to calculate the sphericity of the glass.