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Results following treatment of third cranial nerve palsy in children
L A Schumacher-Feero1, K W Yoo, F M Solari
1Department of Ophthalmology, University of Pittsburgh School of Medicine, USA.
Insights
Oculomotor (CNIII) palsy in children often requires surgery for cosmetic alignment and eyelid position, but rarely restores binocular function. Early amblyopia treatment is key for maintaining existing visual acuity.
Area of Science:
- Ophthalmology
- Pediatric Neurology
Background:
- Oculomotor nerve (CNIII) palsy in children presents diverse etiologies, including congenital factors and postnatal trauma.
- Early onset palsy (before age 8) significantly increases the risk of amblyopia development.
Purpose of the Study:
- To investigate the causes, and sensory, motor, and cosmetic outcomes of treating pediatric oculomotor nerve palsy.
- To evaluate the effectiveness of surgical interventions for CNIII palsy and associated conditions like amblyopia and blepharoptosis.
Main Methods:
- Retrospective review of clinical records for 49 children diagnosed with CNIII palsy between 1981 and 1996.
- Analysis of long-term follow-up data, including visual acuity, ocular alignment, binocular function, and eyelid position.
Main Results:
- Congenital and trauma-related CNIII palsy each accounted for one-third of cases.
- 56% of affected eyes achieved visual acuity between 6/5 and 6/12. Surgical correction improved ocular alignment and blepharoptosis but rarely restored binocular function.
- Amblyopia treatment was ineffective in improving already diminished visual acuity.
Conclusions:
- Pediatric CNIII palsy may partially resolve but frequently necessitates surgical intervention for cosmetic improvement.
- While surgery enhances ocular alignment and eyelid appearance, restoring binocular function remains challenging.
- Multiple surgical procedures are often required for optimal outcomes, and amblyopia management focuses on preserving existing vision.
Purpose:
To investigate the etiology, sensory, motor, and cosmetic results of treatment for oculomotor (CNIII) palsy in children.
Methods:
We conducted a retrospective review of the clinical records of children with a diagnosis of CNIII palsy who were followed up in our practice between 1981 and 1996.
Results:
During the 15-year period, 49 children with 53 affected eyes were followed for a mean of 5.5 years. CNIII palsy was congenital in one third of cases and secondary to postnatal trauma in another third. Thirty-three of the eyes were affected before visual maturation (age 8 years) and 27 eyes developed amblyopia. None of the 6 eyes with amblyopia in which visual acuity could be quantitated had measurable improvement of Snellen acuity after treatment. Overall, visual acuity was between 6/5 and 6/12 at the last follow-up visit in 56% of affected eyes. Ocular alignment was greatly improved after recess-resect procedures on the horizontal rectus muscles, but binocular function was difficult to preserve or restore. Blepharoptosis improved after levator palpebrae muscle resection or eyelid suspension procedures.
Conclusions:
CNIII palsy may undergo partial resolution in children, but surgical treatment is frequently necessary. Although surgery can result in cosmetically acceptable alignment of the eyes, it rarely results in restoration or achievement of binocular function. Multiple procedures are often necessary to maintain good ocular alignment. Several surgical procedures may be needed to correct related blepharoptosis and maintain an acceptable eyelid position. Treatment of amblyopia is only effective in maintaining the level of visual acuity present at the onset of the CNIII palsy, and improvement in acuity is difficult to achieve.
