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I've had leaf miners in my kale and a bit on my peppers, but when I went to look at my peas this morning (snowpeas) I noticed some of the leaves were totally clear - still leaf miners or something else?

They are growing in 5 gal buckets at the moment with some corn that's pretty dead, otherwise have good water and are all at least a foot tall.

I wouldn't think leaf miners, which just leave the squiggly trails.

I'm not sure I'm getting the picture. Do you really mean clear like transparent, see-through? Or clear like pale, blanched?

Totally see through. The leaves are pretty light structurally (thin, delicate) so you don't even see the lacework, just this giant transparent spot that isn't a hole.

That would be ... weird. I'll snap a pic at lunch to show you - headed out in a bit.

So the peas are growing in a bucket where the corn grew? Was the fertility replenished? Corn is a heavy feeder. I know the peas are nitrogen fixers, but there might be other nutrients lacking. I looked around and the only suggestions I found about transparent leaves were iron deficiency. I think that would usually lead to chlorosis - getting pale yellow between the veins, but still having green veins. But I read that sometimes it can look more like what you are talking about.

The corn never got over 2 feet high. I need a macro lens, but it's def catepillars .... the structure of the pea is so fine that you can't really see it without getting super close, and not on a foggy morning.

I've just had the same thing happen recently to the leaves of my tomato plants growing in containers. I found tiny green caterpillars that I think are inch worms. They do a lot of damage quickly so I bought BT (thuricide) and sprayed the plants with it.