Basic Principles of Stereo Fundus Photography
As early as in sixteenth century, filter lens had been used to draw a certain difference in the color of the image for the eyes to produce stereovision. Wheatstone invented the reflecting mirror stereoscope (Fig. 1.1) in 1838, just like the synoptophore, to prove stereovision is based upon the fusion images of both eyes. In 1849, refraction stereoscope (Fig. 1.2) was developed by Brewster, who put two +5D lenses in front of left and right pictures and made these two lenses outwardly eccentric to produce prism effect separately for both eyes. This method can be taken under different vergence distances and the distance between the lens and the pictures can be adjusted to match the accommodation needs.
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