I wonder what the following situation would be:

Lets say you have a valid medical, go in, and are denied the next one
(for some improvable reason, like you failed the eye exam or high blood
pressure). You then later return and pass the medical. After the
valid one expires, can you then fly Sport Pilot? It would really bite
to not have the option if someone failed an eye exam or something 20
years ago because they didn't know they needed glasses yet.