Item	Overall mean score	prHD mean score	HD mean score
Reading	0.33	0.21	0.48
Tracking while reading	0.29	0.22	0.37
Tracking objects with eyes	0.08	0.11	0.03
Balance on one foot	0.98	0.51	1.56
Balance when walking	0.76	0.44	1.17
Shifting gaze	0.12	0.12	0.12
Fine motor ability	0.66	0.16	1.28
Complex motor behavior	0.50	0.18	0.90
Writing	0.96	0.49	1.55
Clumsiness	0.88	0.55	1.29
Functional impact	0.80	0.44	1.24