Cerebral Palsy for the Pediatric Eye Care Team—Part II: Diagnosis and Treatment of Ocular Motor Deficits

Abstract

IntroductionCerebral palsy is a term used to describe a spectrum of neurological deficits resulting from damage to the developing nervous system. This paper, the second in a series of three articles, will present frequency, diagnosis, and management of the ocular motor deficits associated with CP. Topics for discussion will include the prevalence and type of strabismus, the effect of CP on eye movement systems, the efficacy of vision therapy for eye movement deficits, and strabismus surgery.MethodsIn 2002, a retrospective chart review of all cases of cerebral palsy referred to the St. Louis Children's Hospital Eye Center was done. Detailed data on the sensory and motor deficits documented in these children was collected. Also recorded was the management strategy and response to treatment.ResultsOf the 131 cases reviewed (mean age 5.2 years at presentation), 84 (64%) had strabismus: 55% esotropia and 27% exotropia. Of those patients tested for eye movement disorders 67 (61%) had evidence of instability of fixation; 85% of the patients had a pursuit deficit; and 80% had some type of deficit in performing saccades. Vergence was affected in 45% of our patients. Of the patients who underwent strabismus surgery, 67% achieved success after a mean number of 2.1 surgeries. Surgical success was associated with mild or moderate CP (P < .0005), and a stable preoperative angle. Six percent of our patients underwent vision therapy for strabismus or eye movement anomalies under the direction of an outside optometrist.ConclusionInfantile strabismus is significantly more common in children with CP than in the general pediatric population. Disorders of eye movements are also very common. Based on our experience and review of the literature there is no convincing evidence that vision therapy significantly improves eye movements or visual functioning. Approximately 2 of every 3 cases of nonaccommodative strabismus associated with CP can be successfully managed with conventional strabismus surgery, though most children will require at least two surgeries to achieve alignment.