Patients age 6 months and older with pediatric eye diseases, including amblyopia, strabismus, cataracts, glaucoma, and developmental abnormalities may be eligible for this study. Candidates will be screened with a medical history, eye examination, and diagnostic procedures that may include routine laboratory testing, X-rays, questionnaires, physical examination, and other standard or specialized tests or procedures as needed. The eye examination includes measurements of eye pressure and visual acuity (ability to see the vision chart), examination of the pupils and eye movements, and dilation of the pupils to examine the lens and retina. In addition, patients will undergo a procedure to record eye movements called oculography, in which special detectors measure infrared light reflected off the patient's eyes while he or she watches lights on a computer screen.