Notable Paper: Tuning The Electronic Absorption Of Protein-Embedded All-Trans-Retinal

The pigments in retinal photoreceptor cells absorb varying wavelengths of light, but the central chromophore, the molecule that actually absorbs the photon is identical.  Its ability to tune the responsiveness comes from the association with other opsins giving an organism the ability to respond from the near ultraviolet all the way to far red.  Interestingly, …

Astronaut Chris Hadfield Explains How Sight Changes In Space

  I ran across this interesting vignette from Astronaut Cmdr. Hadfield (his Twitter account here) on how sight changes in space including the flattening of eyeballs, swelling around the optic nerve and the random flashes of light seen by astronauts. Cmdr. Hadfield lived on board the International Space Station for 5 months, performing experiments and doing …

The Cilium

With the exception of a few types of cells, (acinar cells, T lymphocytesand hepatocytes), every cell in your body has a cilia.  In the vision community, we are used to seeing these structures in the distal portion of the photoreceptors.  The reality is that every cell in the retina has a cilium and some cells use …