Speed of light and nature of spacetime

Looking back at the discussion on light travelling through a medium, and the 'partial' explanations raised anoter thought - maybe some views on this out there.

From a photon's viewpoint, it travels at c thus time is meaningless - it 'exists' everywhere it travels at the same time! However, matter interacts with space (creates fields - gravity, electromagnetism, etc) so how does the photon 'see' this? As the photon cannot detect time, it must detect a change in space, which through relativity, an observer in space-time detects as an interaction showing up as a change in phase/velocity/refractive index.

Any views on this?

Owen

From the point of view of a photon (traditionally) the life of the universe passes by in a single instant.
It exists as the intermediate point between spacelike and timelike curves. So in truth in would be just as likely to not detect a change in space.