Pendular Nystagmus

𝗢𝗿𝗶𝗴𝗶𝗻𝗮𝗹 𝗗𝗲𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻: This is an example of pendular nystagmus, where like jerk nystagmus, the slow phase initiates the movement. However, unlike jerk nystagmus, there is no fast phase, but rather back to back slow phases resembling a pendulum. Pendular nystagmus is named after the vector, making this mainly a horizontal (with a slight elliptical trajectory) pendular nystagmus. This patient presented with ‘sitting' oscillopsia (from her nystagmus) due to a progressive neuro- degenerative disorder (of unknown etiology) that led to severe atrophy of the brainstem and cerebellum over years. 𝗡𝗲𝘂𝗿𝗼-𝗼𝗽𝗵𝘁𝗵𝗮𝗹𝗺𝗼𝗹𝗼𝗴𝘆 𝗮𝗻𝗱 𝗡𝗲𝘂𝗿𝗼-𝗼𝘁𝗼𝗹𝗼𝗴𝘆 𝗧𝗲𝘅𝘁𝗯𝗼𝗼𝗸 𝗟𝗲𝗴𝗲𝗻𝗱: This is an example of pendular nystagmus, where like jerk nystagmus, the slow phase initiates the movement. However, unlike jerk nystagmus, there is no fast phase, but rather back to back slow phases resembling a pendulum. Pendular nystagmus is named after the vector, making this mainly a horizontal (with a slight elliptical trajectory) pendular nystagmus. This patient presented with ‘sitting' oscillopsia (from her nystagmus) due to a progressive neurodegenerative disorder (of unknown etiology) that led to severe atrophy of the brainstem and cerebellum over years