I do not have a machine needle threader but.... I often will hold a small piece of white paper, post-it or even a small piece of white fabric behind the needle and the eye shows up more clearly. I can then thread the needle and away I go. I do the same when threading needles for hand work. Hint #2, I turn on my cell phone and hold my needle (hand work) over the screen and the light will reveal the eye of the needle. Haven't tried it with my machine needle.