Trial Haptic contact lens set [Hirst Try Set]
Maker and role
Hirst Contact Lens Limited, Manufacturer
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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.