Tomato plants with small, misshapen leaves

I have several tomato plants which are generally doing well. They are 5' tall in the northeast US. However, some of them have tiny, wrinkled leaves
on the upper 2/3s of the plants, but the lower 1/3 are normal and healthy. They almost look as if someone picked all the leaves off the upper stems leaving a little bit of leaf behind.
What would cause this and what does it mean? All but one of these plants are Sweet 100 cherry tomatoes.
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Michael Moroney wrote:

look on the ground to see if there are droppings from tomato worms or tobacco worms or some other chewing caterpillars. google types of tomato worms for pics.
if you go out in the early morning you can often find them around where they have been chewing but they can be well disguised if you don't know what you are looking for.
songbird
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