1 AIM To investigate the change of electronystagmography (ENG) in sleep apnea syndrome (SAS) patients and its clinical significance.

2 OBJECTIVE To analyze the causes and features of electronystagmography (ENG) in middle and elder aged vertigo patients.

3 With electronystagmography (ENG), various tests were carried out in 16 patients of congenital and 10 patients of acquired nystagmus.

4 Methods A comparative study was carried out among 415 cases with vertigo to analyze the clinical usability of SPG with that of electronystagmography(ENG).

5 Objective To assess quantitatively the therapeutic effects of surgical intervention on congenital nystagmus (CN) with electronystagmography.