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Zusammenfassung:
Exner's theory of image formation by superposition was tested in representatives of the insect orders Lepidoptera, Neuroptera, Coleoptera and the crustacean order Decapoda whose eyes contain a proximal reflecting tapetum. Projection of light into one single facet caused the completeeyeglow in the dark adapted eyes. Position and size of the glow were independent of the position of the illuminated facet within the glow area for constant direction of illumination. All tested eyes showed similar optical properties. The results confirm the superposition theory which seems to describe adequately a widespread functional type of compound eye.