Orthoptists are concerned with the diagnosis and treatment of ocular motility and problems relating to vision. Some examples of these problems are:
Amblyopia (lazy eye), which is a reduction in vision arising from a defect present in infancy or early childhood that prevents the eye from receiving adequate visual stimulation.
Defective binocular vision, which is the inability to use the two eyes together in the correct way and which leads to impairment of depth perception.
Abnormal eye movements arising from injury or disease affecting the eye muscles or the nerve supplying the muscles, or a physical obstruction to eye movement.
Diplopia (double vision) resulting from abnormal eye movements or strabismus (squint).