visual system

  • stemmata
    • URI: http://purl.obolibrary.org/obo/UBERON_0000046
    • Definition: Eye-spots which may be set into a pit to reduce the angles of light that enters, to allow the organism to deduce the angle of incoming light. Lens-like structures may be present, but stemmata, unlike lens eyes, cannot form an image, either for lack of refractive power or retinal resolution.
    show all records