Causes (1) Care (1) Diseases (1) Methods (1) Year (1) Wayfaring life (1) Visual acuity (1) Vision disorders (1) Risk (1) Pathology (1) Glaucoma (1) Errors (1) Error (1) Causation (1) Methods (1) Use studies (1) Use studies (1) Disabilities (1) Valuation (1) Measurement (1) Age (1) Sampling (1) Rating of (1) Population (1) Origin (1) Health (1) Evaluation (1) Educación--Fines y objetivos (1) Vista--Defectos (1) Origen (1)