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The amblyoscope (cover image) is an instrument that was designed to develop the fusion faculty of a young patient with squint. The Worth amblyoscope was first constructed in 1895 by Mr Hawes of AW Hawes, Opticians in Leadenhall Street, London. It consists of two equal halves joined together in the middle by a hinge. Each half has a short tube of 1.5 inches diameter which is joined to a longer one at an angle of 120°. At the end of the tube there is a slide carrier where pairs of slides with complementary images such a bird and a cage can be mounted (figure 1). The paired objects that are mounted in the slide carrier are simple diagrams pasted on glass or etched on plastic. The arc can be moved …
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