Children and adults currently enrolled in a cystinosis study at the National Institutes of Health may participate in this trial. They will receive the current cysteamine formulation in one eye and the new preparation in the other eye. The drops will be given every hour during waking hours. Patients will be observed daily for the first week of treatment and will be called at 2 weeks and 4 weeks to check on side effects, if any. At 6 months, they will undergo a repeat eye examination. Patients (or their parents) will keep a daily diary recording the condition of each eye.