We use Present Progressive if we want to emphasise that an activity...
1. is happening at now.
He is watching TV now.
2. differs from what is expected or usual (PS - PP)
He usually gets up at 7, but this week he is getting up at 8.
3. is disliked by the speaker or evokes ambivalent feelings.
He is always listening to that stupid disco record!
If you try to fit your sentence into these rules, you'll find out that it would be possible to use it in PP, but there's an adverb of time in the sentence (from time to time) that is a synonym for sometimes and that AoT usually goes with Present Simple.
On the other hand, now and from time to time in the same sentence are a bit erroneous. Please consider the following alternatives:
Now I am wearing my contact lenses. (Now I am having to because I would not see anything but vaguely otherwise.)
I wear my contact lenses from time to time. (I wear them, even though I don't need them day in day out.)