Videonystagmography to Assess Eyelid Dynamic Disorders

Abstract

Objectives: Apply a videonystagmography (VNG) device to study indirectly blinking in patients with essential blepharospasm. Patients and Methods: A VNG device was used to study the pupillary occlusion. It was recorded and analyzed as indirect parameters of blinking in 23 essential blepharospasm on day 0, month 1, and month 3 following botulinum toxin injection using VNG. Results: Botulinum toxin significantly reduced pupillary occlusions (PO) frequency (9.6 PO/min on D0 and 4.7 PO/min on M1 (p = 0.004), and average PO time (0.95 sec on D0 and 0.58 sec on M1 (p = 0.03) for PO higher than 0.3 sec. On the other hand, it does not have any action on frequency (32.4 PO/min on D0 and 31.3 PO/min on M1 (p = 0.7) and average PO time (0.16 sec on D0 and 0.15 sec on M1 (p = 0.4) of PO lower than 0.3 sec. Conclusion: Video acquisition computer-assisted makes it possible to measure blinking parameters indirectly in real time and to assess essential blepharospasm objectively. The protocol analysis of PO is attractive for indirect analysis of blinking.

Keywords:

• blink
• pupillary occlusion
• botulinum toxin
• objective assessment
• videonystagmography