Connection between caustics and conjugate points?

Conjugate points on manifolds are, roughly speaking, points which are connected by a multitude of geodesics, so that there are problems with uniqueness of the shortest path between the points.

In symplectic geometry there is the concept of caustics, https://en.wikipedia.org/wiki/Caustic_(mathematics). These seem to be related to concentration of rays. My knowledge of symplectic geometry is not formidable, and it would take a bunch of reading to get a handle of that definition, so a question:

I would appreciate an explanation that is more about intuitive understanding than a formal proof, though of course a more formal explanation is also very welcome.

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Connection between caustics and conjugate points?

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