Description

A very rare Thomas Young optomter, the first optometer made for determining the eye’s state of focus, making it possible to prescribe appropriate correction lenses.

The present example is unsigned but French and circa 1805-1820, before the generalization of the metric system, as suggested by the engraved phrase: “N[umer]os des verres en pouces [number of the lenses in [French) inches]”.

Young optometer is the first modern optometer invented, first presented by Young in 1801 during The Bakerian lecture “On the mechanism of the eye”.

This French example is in good and genuine condition : the optics works well and there is no restoration.

The optometer measures 3,5 diameter and 30-53 cm lenght.