Toric Lens grinding machine

Hirst Contact Lens Limited, Manufacturer

1947
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Details


Maker and Role
Hirst Contact Lens Limited, Manufacturer
Production Date
1947
Description
Toric lens grinding machine, composed entirely of metal parts. The machine has a square flat base. In the centre of the base are two uprights with a cross bar at the top. In the centre is a spring mechanism which can be adjusted using the two screws holding it in place. Underneath is another horizontal metal bar which is supported by two rods, acting like a U-shaped swing. There is a cylindrical base in the centre which holds a mushroom-shaped rest for holding a contact lens. There is an arm protruding from one of the uprights which controls this swing, allowing the whole surface of a contact lens to be ground. To one side of the base is lower set of uprights that hold a metal rod with a circular attachment on one end. This part also rotates. There are additional screws protruding from the object and two screw holes in the base. Possibly there are some missing components. There is a small wrench and a card which reads “Toric Grinding / Machine - / Made in Auckland 1947”.
This machine was made in the Hirstlens engineering workshops. It was designed to enable a Toric (two radii of different value) surface to be ground on the surface of a haptic lens. The finished lens would be fitted to correct the patent's astigmatism.
Media/Materials
Processed Material/Metal
Signature/Marks and Type
TOP Engraved
Toric Grinding / Machine - / Made in Auckland 1947 Hand-written
Accession No
2018.1.5
Credit Line
Hirst Contact Lens Limited. 1947. Toric Lens grinding machine, 2018.1.5. The Museum of Transport and Technology (MOTAT).
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