Brain pathology, eye movement disorders, and basic science of ocular movement.

Diagnosis of eye movement disorders is an important step in evaluation of patients with developmental or acquired brain lesions. A better understanding of the various pathologies requires both a detailed clinical examination and the analysis of eye movement recordings (nystagmus of various types, saccade, and pursuit anomalies). Basic science studies help to interpret these eye movement disorders.

Nystagmus.

Electronystagmographic studies with an attempt to quantify various parameters of congenital nystagmus are interesting although not conclusive clinically. This is due to the spontaneous variability of congenital nystagmus. A qualitative study (position and velocity) may be sufficient for clinical examination and treatment of congenital nystagmus.