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Kelvin Vertex Chart
ARCHIVAL ITEMS
selection chart
Kelvin Lenses Limited
Europe: United Kingdom, England, Lancashire, Manchester
Late 20th c.
card; paper
overall: 225 mm x 119 mm
2021.188
ARCHIVAL ITEMS
selection chart
Kelvin Lenses Limited
Europe: United Kingdom, England, Lancashire, Manchester
Late 20th c.
card; paper
overall: 225 mm x 119 mm
Set of charts for calculating the power of a contact lens at a given vertex distance. Double-side chart for the effective power of lenses in air, minus powers, and single-sided chart for the same in plus powers, both pasted into an outer card cover pink on the outside with glossy finish.
2021.188
Gift of Mr Graeme Holland, 2021