. Author manuscript; available in PMC: 2023 Jul 19.

Published in final edited form as: Neurol Clin. 2022 Aug 31;41(1):21–44. doi: 10.1016/j.ncl.2022.05.002

Table 1.

Specific eye findings seen in cerebellar ataxia syndromes

Square Wave Jerks	Friedreich Ataxia
Slowed saccades	SCA2 SCA3 SCA7
Downbeating nystagmus	SCA6 Multiple system atrophy
Pigmentary retinal macular degeneration	SCA7
Ophthalmoparesis	SCA2 SCA3 SCA7 Kearns-Sayre syndrome Miller Fisher syndrome
Oculomotor apraxia	Ataxia with oculomotor ataxia types 1 & 2 Ataxia telangiectasia
Supranuclear ophthalmoplegia	Niemann-Pick type C
Retinitis pigmentosa	Refsum disease Abetalipoproteinemia Kearns-Sayre syndrome Neuropathy, ataxia, & retinitis pigmentosa

Abbreviation: SCA, spinocerebellar ataxia.