"These findings suggested that damage to the corneal epithelium was not induced by corneal dryness alone, but by exposure of dried corneas to MMW-induced heat to above body temperature."

So as long as I don't microwave my corneas with my phone, I should be alright. Thanks!

edit: hell, even the researchers say this themselves:

"It is an important finding that corneal epithelial damage is induced by MMW exposure, accompanying very strong pain, although it is cured within 1–2 days after injury. Since humans blink more frequently than rabbits, exposure to these levels of MMW is unlikely to induce corneal epithelial damage in humans."