Historical information

This case only includes spherical lenses and has no cylindrical lenses for correction of astigmatism. The lenses have no rims, which was unusual after 1900. The set appears to have had very little use as it is in excellent condition.

Significance

This is a late example of a trial case comprising only spherical lenses. The trial frame is a very rare type.

Physical description

Small timber cased trial set of spherical lenses only. No rims on lenses. Case labelled with lens powers in dioptres and inches. Trial frame included of unusual design:each eye rim has a sprung top cover to secure lens in place. Nickel alloy. Fixed bridge stamped 62, tapered sides with loop ends. Also a lens handling tool (nickel alloy) to position a lens in front of patient's eye.

Inscriptions & markings

Lens powers labelled in inches and dioptres. Trial frame bridge stamped '62'.