ā | Number of patients (age in years) | Referral by a pediatrician in % | Referral by a primary-care physician in % | Referral by an ophthalmologist | Refractive disorders in % | Patients with astimgatism in % | Patients with hyperopia in % | Patients with myopia in % | Patients with nystagmus in % | Patients with strabismus in % | Patients with keratoconus in % | Patients with cataracts in % | Spectacles prescribed in % |