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Feinbloom Trifocal units
OPHTHALMIC LENSES
low vision lens
North America: USA
1958
plastic; glass
overall: 37 mm
2013.714
OPHTHALMIC LENSES
low vision lens
North America: USA
1958
plastic; glass
overall: 37 mm
Three trifocal glass telescopic low vision units ('trioptics'), comprising a plastic carrier lens with, at the top, a bifocal glass telescope (two different designs: reduced aperture wide angle 2.2X and reduced aperture miniature telescope) and in two instances, at the bottom, a microscopic near vision segment.
2013.714
The Norman Bier Collection, transfer from City University, 2013