Brock String, Vision Convergence Insufficiency Training Tool for Eye Muscle S...

It arrived in a good condition, both the bead and the string are of good quality. The bead also doesn't shift easily so it is great!

It's good. The beads slide easily but stay where you put them. The string is easy to tie and untie. The string can be drawn taunt and bounce is easily controlled.

Prodotto come promesso. Ottimo.

Works as expected. Cheaper than trying to make one yourself.

This string provides a means to work on convergence problems. I have excellent vision in my eyes but when I'm tired etc. I start seeing double --especially watching the television. I can see improvement after just a few sessions of the exercises. Hopefully before long I will no longer have the problem. Comes with instructions in English! They just don't indicate how long one should do them. If you get one, practice at least a few minutes at a time.