/oss/taxonomy/term/2759/all en /oss/article/you-asked/why-do-we-see-things <p>Light enters your retina and is detected by <a href="https://en.wikipedia.org/wiki/Photoreceptor_cell">photoreceptor cells</a>, of which humans have 3 specialized kinds- rod cells, cone cells and photosensitive retinal ganglion cells. The retinal ganglion cells are a bit different than the rods or cones, as they do not help you see directly, but sense light none the less, and use that information to help with circadian rhythms to regulate sleeping, and to help pupils know when to contract or dilate.</p> Fri, 01 Sep 2017 14:01:09 +0000 ada.mcvean@mail.mcgill.ca 2616 at /oss