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

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.

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.

It does exactly what it is supposed to do. It is of good quality and has been helpful.

Cheap and does the job for any eye issues if you use it consistently

I was able to use this to strengthen my eye convergence at home as well as I could using the beads at therapy.

The string quality is excellent. The beads move freely enough when you want to move them but stay put where you place them. Simple eye tool that is very well constructed.

I read a lot of reviews that mentioned the beads being loose on the string, but I did not find that to be the case. The string is good quality and the beads fit well and stay in place, yet are easy to position. The item comes with directions and I received an email from the seller with a pdf of the same sheet, which I appreciated. My only issue is that my eyes freakin suck! I have a prism of 21 in my glasses, an extreme case of diplopia. I don't have "googly eyes (what my wife teases me about), but they just don't like working together as they tend to act esotropic. I am somewhat discouraged that I simply cannot see a single image of a bead if it is positioned more than 5 inches from my face. The directions provided do not provide any guidance for this issue but I was able to find some tips on other internet sources. If anyone else has the same issue, use an index card to cover your dominant eye and focus hard on the bead with the other eye. Slowly remove the index card and it can help bring the two images of the bead closer together. Alternatively, simply closing your eyes for a second can bring them close as well. I realize this item isn't necessarily sold to treat a medical condition, but perhaps the seller can add these tips in for sports use? All in all, fantastic product and great customer support!

Had a Brock String for one of my children some years ago. The beads were much larger than on this product, and therefore, easier to see. That can be important for someone trying to work on vision problems. The third bead out in the standard 3-bead set up is light green, which adds to the difficulty of being able to see it. Had to order larger replacement beads. Also note, the beads are not anchored in place with knots. You have to read the instructions, get out a ruler, and tie the beads n place yourself.