Orthoptists diagnose and treat anomalies of binocular vision. They examine, assess and treat vision impairments, squint, amblyopia and eye motility disorders. Orthoptists apply these methods in particular in the fields of paediatrics, neurology, neuro-ophthalmology, ophthalmology, orthoptics, optometry, pleoptics and strabology assessing functional diseases of the eye for improving functional disorders of the visual system. They also provide counselling, preventive measures and training activities and may refract and prescribe glasses, such as prism corrective glasses.