Table 1.

Main saccadic features in PD and genetic parkinsonisms.

	PD	PARK1	PARK2	PARK6	PARK9	HMNDYT1	NBI	Gaucher disease
Horizontal saccades
Latency	Norm/↑	↑	Norm	↑	Norm/↑	↑	NA	↑
Gain	↓	Norm	↓	Norm	↓	Norm	Norm	↓
Precision	↓	Norm	NA	NA	↓	↓	NA	↓
Velocity	Norm	Norm	Norm	Norm	↓	Norm	Norm	↓
Vertical saccades
Latency	Norm/↑	↑	Norm	NA	↑	↑	NA	Norm
Gain	↓	Norm/↓	↓	NA	↓	Norm	↓	↓
Precision	↓	Norm/↓	NA	NA	↓	↓	↓	↓
Velocity	Norm	Norm	Norm	NA	↓	Norm	↓	↓
Multistep frequency	↑	↑	NA	↑	↑	↑	NA	NA
Antisaccades
Latency	↑	↑	Norm	Norm	↑	↑	NA	NA
Errors	↑	↑	↑	Norm	↑	↑	NA	NA
Corrections	NA	Norm	NA	NA	↓	Norm	NA	NA

PD, Parkinson’s disease; PARK, Parkinson’s disease-related locus; HMNDYT1, hypermanganesemia with dystonia, polycythemia, and cirrhosis; NBI, neurodegeneration with brain iron accumulation.