Akwai, duk da haka, sau ashirin fiye da sanda Kwayoyin fiye da sanda Kwayoyin a cikin retina saboda sanda Kwayoyin suna samuwa a fadin wani m yanki. Saboda da fadi da rarraba, sanda Kwayoyin ne alhakin peripheral hangen nesa. A bambanci, akwai biyu iri photoreceptor Kwayoyin ne kasa m ga overall tsanani na haske, amma zo a cikin uku iri da suke da m zuwa daban-daban mita-range da kuma ta haka ne a cikin fahimta na launi da kuma m hangen nesa. Sanda Kwayoyin ba su kasance a kan fovea, da yankin na retina alhakin tsakiyar hangen nesa, kuma ba su zama kamar yadda m kamar yadda sanda Kwayoyin a cikin retina saboda sanda Kwayoyin ne a fadin wani m yanki.
ƙwayoyin sanda