Table 1.

Eye movement characteristic parameters in the two GD sisters (A. I. and F. I.) compared to mean values and SD of 10 normal subjects (and corresponding confidence interval at P = .05). A/D m: slope of the amplitude/duration linear relationship; A/D q: intercept of the amplitude/duration linear relationship; A/V _p 1/α: velocity saturation value of the non linear amplitude/peak velocity relationship; A/V _p 1/β: slope at the lowest amplitude of the non linear amplitude/peak velocity relationship; A/K m k: slope of the linear amplitude/K ratio relationship; A/S K m s: slope of the linear amplitude/skewness relationship.

		A/D m	A/D q	A/V p 1/α	A/V p 1/β	Latency	A/K m k	A/S K m s
		ms/deg	m s	deg/s	1/s	m s	1/deg	1/deg
A. I.	2000	2.77	29	646	75	174	0.0041	−0.028
	2005	2.61	31	628	63	198	0.0040	−0.026
	2007	2.48	33	881	69	173	0.0015	−0.005
F. I.	2000	2.69	46	570	56	191	0.0031	−0.019
	2005	8.77	50	259	56	203	−0.0002	−0.0006
	2007	2.52	30	851	53	199	−0.0007	0.0014
Normal Subjects	mean	1.86	36	1282	61	188	0.0023	−0.013
	SD	0.47	5	355	15	36	0.0022	0.011
Conf. Int. (P = .05)	min	0.86	25	524	28	111	−0.003	−0.036
	max	2.86	47	2040	93	265	0.0072	0.01