Optics: diagrams of reflection and refraction of light. Coloured engraving by R. & E. Williamson, 1820.

Optics: lens grinding tools and different products with lenses. Engraving by Benard after J.R. Lucotte.

Optics: crystals exhibiting interference colours. Colour mezzotint by R.H. Digeon, ca. 1868, after J. Silbermann.

Optics: spectra of various pigments, compared with that of our Sun. Coloured process print by Cassell.

Optics: interference phenomena, exhibited by diffraction gratings. Coloured mezzotint by M. Rapine [1883], after B. Desgoffe.

Optics: crystals exhibiting interference colours. Colour mezzotint [?] by R.H. Digeon, ca. 1883, after J. Silbermann.

Optics: a colour-circle, after M. E. Chevreul. Colour aquatint (?) by R.H. Digeon, ca. 1868.

Optics: a soap bubble exhibiting interference colours. Colour mezzotint (?) by M. Rapine, c. 1883, after B. Desgoffe.

Optics: colour scales for violet and yellow. Colour mezzotint [?] by R.H. Digeon, ca. 1868, after J. Silbermann.

Optics: lens grinders at work (top) and stages in grinding a lens with the tools used (below). Engraving by Benard after Lucotte.

A lecturer (William Kitchiner?) about to address a lecture on optics with the aid of candles, a telescope and magic lantern to a seated audience, he is interrupted by a Kentish hop merchant. Coloured etching, 1809, after G.M. Woodward.

Zebrafish optic chiasm

Dysplasia, septo-optic

Canine eye: optic nerve hypoplasia

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