Hi There,
I'm a retired vision therapist and I can bring you up to speed on convergence insufficiency quickly. I used the home version of HTS at work. It's excellent, especially for convergence insufficiency. The only problem, you can only purchase it through an optometrist. You will probably be referred to one that specializes in Vision Therapy. Which isn't a bad idea at all. However, if money is an issue and convergence insufficiency is the only problem, make a Brock String. It's an old- fashioned remedy for those who could not cross their eyes in. Get a piece of string about 18 inches long and tie a knot at one end. Thread the other end through a nickel sized button. Tie a knot at the other end. This is a Brock string. Tie one end to an object in front of the person who needs to learn to cross the eyes inward. Place the other end of the string at the tip of the nose. (Make sure not to cover either eye when doing this) The nose end of the string should be higher than the other end so the person is looking slightly downward. The person should move the button away as far as they can reach. The person should be seeing one button with the illusion of two strings forming a V . As the button is moved forward, you should see the person's eyes converging when they stop crossing in, the person should see double buttons. Moved the button back and start over. As the person moves the button forward, the illusion of the V becomes an X. The X should always cross exactly at the button when it is being properly converged upon. If it crosses in front of or behind the buttton uncontrollably, this is a bigger problem. Also, if the person cannot see the illusion of a V or X, this is a sign that the brain is suppressing the vision in one of the eyes. This exercise is not intended for people who over-converge (cross eyes in). In fact it will harm you more than help you. Only for the simple Convergence Insufficient. If you do get the referral, make sure the Dr's intials include COVD which means they have been trained specifically for vision development.