Trial Haptic contact lens set [Hirst Try Set]

Maker and role
Hirst Contact Lens Limited, Manufacturer
Production date
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Trial Haptic contact lens set. A rectangular box covered in a brown reptile skin with “HIRST TRY SET” stamped in gold on the lid. The box is fastened with a snap clasp. On the underside of the box are four blue felt circular feet. Inside the container is a cream suede lining which holds ten contact lenses in two rows. Each lens has white writing along the edge, for example, “22/5”.
This set of haptic trial lenses were made by Hirst circa 1943. Haptic or scleral lenses were so named because they rested on the sclera (the white outer portion of the eye). Each lens has a different BCOR (Back Curve Optic Radius) which relates to the patient’s prescription. The steepness of the curve was altered to fit the individual patient’s cornea. The trial lens set was used to determine the best fit for the patient’s eye.
HIRST 25/7, HIRST 22/7, HIRST 22/75, HIRST 27/7, HIRST 27/75, 25/7, HIRST 24'5/75, HIRST 25/75 Hand-written
Other name
scleral lenses
Credit Line
Hirst Contact Lens Limited. 1943. Trial Haptic contact lens set [Hirst Try Set], 2018.1.2. The Museum of Transport and Technology (MOTAT).


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