The published clinical studies of orthoptics/vision therapy for convergence insufficiency show that a limited number of office visits are required for resolution of convergence insufficiency. Published clinical studies of vision therapy/orthoptics for convergence insufficiency show that the average number of office visits for convergence insufficiency is usually less than a dozen. Only Hoffman (1973) reported a much higher average number of office visits (24); all vision therapy exercises were conducted in the office. The orthoptic (ophthalmology) literature reports successful treatment of convergence insufficiency with fewer office visits than are reported in the optometric vision therapy literature. Orthoptists/ophthalmologists rely more on home exercises, whereas optometric vision therapists tend to perform more in-office therapy.
Heath and colleagues (1976) examined the effectiveness of oculomotor and convergence exercises on 80 second- and third-grade children who had scored below the 40th percentile on a reading test and in the deficient range on an oculomotor tracking examination. Subjects were randomly assigned to 4 groups: group 1 received oculomotor and convergence exercises with propioceptive (touch) reinforcement; group 2 received exercises without reinforcement; group 3 received perceptual exercises (sham treatment); and group 4 received no treatment. Seventeen of the 80 subjects dropped out before the end of the study; however, intention-to-treat analysis was not performed. Subjects were treated over a 12-week period; the frequency of vision therapy visits was not specified. Group 1 (exercises with propioceptive showed significantly larger improvements in measurements of pursuits and convergence than the other groups, including group 2 which received vision therapy exercises alone. On tests of reading and eye tracking, group 1 scored significanly better than the group receiving no treatment (group 4); differences in improvments in reading between group 1 and groups 2 and 3 were not statistically significant. The study did not determine whether the group receiving vision therapy alone (group 2) scored statistically significantly better on each of these variables than the group receiving sham treatment (group 3) and the group receiving no treatment (group 4). It is unclear whether the improvements in group 1 were a result of convergence exercises or exercises to improve oculomotor function. Finally, this study examined the effectiveness of vision therapy in improving skills related to reading ability, and not the effectiveness of vision therapy in relieving symptoms related to oculomotor dysfunction.
Duam (1983) reviewed medical records of 114 patients referred to a university binocular vision clinic and subsequently diagnosed with accommodative deficiency. Ninety-six percent of these patients were diagnosed as having either accommodative insufficiency or accommodative infacility. Most patients were diagnosed with other visual problems as well. Patients were given standard in-office vision therapy once every 1 or 2 weeks, and prescribed vision therapy exercises to perform at home 3 times per week. The average duration of treatment for treating only the accommodative symptoms was 3.7 weeks; the total duration of treatment for all of the patients’ visual problems was not provided. Ninety-four of the patients completed treatment. Of those patients completing treatment, 53 % were considered totally successful (defined as elimination of symptoms and signs of accommodative deficiency), 43 % were partially successful (where there was at least some reduction in either signs or symptoms), and 4 % were considered unsuccessful (no relief of signs or symptoms).
The doctor may give your child exercises to do if he has , a loss of in one because he uses the other more. The condition usually starts in childhood. First your child will get , if he needs them. Then the doctor will put a patch over his good eye, or use eye drops to blur vision in it, so he has to rely more on the . Vision therapy exercises can also force the to see through the weaker eye, which helps restore vision.