The economy of the eyes: precepts for the improvement and preservation of the sight. Plain rules which will enable all to judge exactly when, and what spectacles are best calculated for their eyes. Observations on opera glasses and theatres, and an account of the pancratic magnifier, for double stars, and day telescopes
A practical guide to eyesight, spectacles and optical instruments written by the London physician and cookery writer William Kitchiner and published by Hurst, Robinson in 1824 for general readers choosing lenses. Engraved figures show numbered eyes, spectacle frames and lens profiles alongside hatched diagrams of light paths and reading stands, useful as technical line ornament or optical instrument reference.
