Nystagmus is a disorder of ocular posture/ mechanisms that maintain steady fixation.
This is characterized by Biphasic, rhythmic, involuntary, repetitive oscillation of the eyes
What is Alexanders law?
According to the Alexanders law the amplitude of jerk nystagmus is largest in the gaze of direction of fast component.
- 1st degree: nystagmus only in the direction of the fast component
- 2nd degree: nystagmus in primary gaze position
- 3rd degree: nystagmus in addition to above gazes, also present in the direction of the slow component
How to detect the amplitude of Nystagmus ?
Amplitude is the excursion of the nystagmus and described as
- Fine: < 5°
- Moderate: 5°-15°
- Large: > 15°
Reference Notes
What is See-Saw Nystagmus ?
What are the causes of Acquired Pendular nystagmus ?
What is Convergence-Retraction Nystagmus ?
Dissociated Jerk Nystagmus and causes
What is Rebound nystagmus and its causes?
What is Bruns's nystagmus?
What is Gaze evoked nystagmus?
Down-beat nystagmus and its causes
Upbeat nystagmus and its causes
What is the basic Pathophysiology of Nystagmus
Alexanders law in Nystagmus - A brief
