1. Crystal Charity Ball Pediatric Vision Evaluation Center, Retina Foundation of the Southwest, Dallas, Texas
2. Pediatric Ophthalmology & the Center for Adult Strabismus, Dallas, Texas
3. Pediatric Ophthalmology & Adult Strabismus, Plano, Texas
4. Crystal Charity Ball Pediatric Vision Evaluation Center, Retina Foundation of the Southwest, Dallas, Texas4Department of Ophthalmology, UT Southwestern Medical Center, Dallas, Texas