Case Definitions and Data Indicators

VEHSS includes the following case definitions. Case definitions are the outcomes tracked by the surveillance system. The VEHSS case definitions are designed to allow similar concepts to be measured in different types of data. For each type of data, Data Indicators define how these concepts are measured.

• Diagnosed Vision Disorders
• Vision Loss and Blindness
• Functional Limitations
• Eye Exams
• Imaging or Diagnostic Tests
• Screening Services
• Glasses or Contacts
• Eye Injury Prevention
• Prevalence of Age-Related Macular Degeneration (AMD)
• Age-Related Macular Degeneration (AMD) Treatment
• Prevalence of Cataract
• Cataract Treatment
• Prevalence of Diabetic Retinopathy (DR)
• Diabetic Retinopathy (DR) Treatment
• Prevalence of Glaucoma
• Glaucoma Treatment
• Cancer and Neoplasms of the Eye
• Cornea Disorders
• Disorders of the Optic Nerve and Visual Pathways
• Infectious and Inflammatory Diseases
• Injuries, Burns, or Surgical Complications of the Eye
• Retinal Detachment and Defects
• Orbital and External Disease
• Other Retinal Disorders
• Other Visual Disturbances
• Strabismus and Amblyopia