<prompt> Which one of the following is not a target disease under ;Vision 2020: The Right to Sight;-Refractive errorTrachomaCorneal blindnessDiabetic retinopathy  <response>: Vision 2020 The Right to Sight Target diseases are cataract, refractive errors, childhood blindness, corneal blindness, glaucoma, diabetic retinopathy. Ref: PARK;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 440 