YES! We did tracking and convergence when Kiddo was diagnosed at 5(he had convergence disorder and still has ocular motor dysfunction, which cannot be 'cured' but biofeedback exercises were great). We did a year of vision therapy and then were deemed 'done' by the optometrist we were working with. (For what it's worth, his attitude toward vision therapy was rather "middle of the spectrum" in that it wasn't hogwash and it wasn't a panacea, it was *eye exercises*... just like any other exercise, it could help strengthen weak muscles.) He gets checked annually.
Some activities which the doc recommended: rolling a small ball (and later, a marble) back and forth and 'catching' it with a cup; using one hand to stack small (read, tiny) blocks as high as you can; using a popsicle stick with a sticker on top or a pencil with a fun eraser to go closer/farther to work the convergence muscles (Kiddo could not cross his eyes at the beginning, they would pull back out of focus when the object came too close).... there were more. Everyday regular activities-- dot to dot, word searches, building with Legos (focusing on small pieces), toss/catch a ball or object. Anything where the child has to focus on an object in movement.
The upside, too, is that you can get a 504 for your child if they need accommodations in the classroom. Something to think about. It helped us when we started with Kindergarten; the teacher knew more about where to place him in the classroom and what to expect. I'd say strongly-- go for it! Nearly everything therapeutic, you can do at home. One word of caution-- try to do things in short spurts, a long school day plus an hour of eye therapy is hard for kids. You don't want them to hate it, you know. We didn't do X minutes every day, just diligently did a couple activities each day. AND I had him in half-day kindergarten, in part because we knew that the full day PLUS this was too much for him. Also, Brain Gym activities sometimes helped. You can find the book online or maybe through your local library. Very easy exercises. :)
And it didn't cost us 5K either! We went through our insurance (we had a referral to an OT before who noticed how he was holding his head and suggested it was a vision issue, not an OT one) and because it is medical, got our insurance to cover some of it. I think we might have paid a few hundred dollars out of pocket. Also call around and check to see if a nearby university has a program which they might offer discounts as their student ophthalmologists/therapists offer services. I just don't want you to be discouraged by comments from other people who haven't even tried it or experienced it... as I said, for my son, it definitely worked. :)
Some resources below on efficacy of vision therapy for convergence disorder:
https://www.ncbi.nlm.nih.gov/pubmed/12477022
http://oepf.org/sites/default/files/Summary%20of%20Resear...