Fused blank ground and polished

Fused blank ground and polished, giving the finished oval astigmatic bi-focal spectacle lens. Final stage in the manufacture of 'Kryptok' bi-focal spectacle lenses.

Details

Category:
Optics
Object Number:
1921-323/59
Measurements:
overall: 50 x 40 mm
type:
ophthalmic lens
credit:
Dunscombe collection of spectacles