My son, who does not have ADHD either, also went through a period of eye blinking. He was 3 1/2 to 4 1/2 at the time. The teacher suggested ADHD but when we had testing done the psych said that he had excellent concentration skills and focus during testing. He also does not show signs of ADHD at home. The teacher ended up bringing in the school counselor and she decided that it was caused by stress. We took him to an opthamologist and everything was fine. It went away during the summer and hasn't come back. In his case, I think the eye blinking was caused by being in a stressful situation at school. He was only doing the blinking in the stressful environment.
