I know this is an old thread but if you havent figured it out yet..the opaque cloudy eye comes from lipid deposits in the eye. This is called Corneal lipidosis. It comes from too much cholesterol in the diet. Crickets are high in cholesterol but it doesen't sound like you're overfeeding. You didnt mention the size of the crickets you were feeding if youre feeding adults you may want to switch to smaller crickets. I had been having the same problem with grey tree frogs but it is hard to find an easily available substitute feeder. If you catch it in the early stages it can be reversible but not always..If you find a good solution let me know
good luck,
Matt