Illustration from Brockhaus and Efron Encyclopedic Dictionary (1890—1907)<br>
Eye, organ of vision. A cut through the eye of the larva of the water lover beetle (Hydpophilus). 1 - Chitinous cuticle, forming in 5th thickening - chitinous lens. 2 - Epithelium, turning into 4 - into pigment cells, the light ends of which (6) represent the vitreous, and into the retina (7). 3 - The main membrane.
painter from Brockhaus and Efron Encyclopedic Dictionary
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