The distinctive vertical heterophoria of dyslexics

Figures & data

Figure 1 How to indicate the position of the line without changing the position of the tongue.

Notes: Thumb up represents red line above the light, horizontal thumb represents red line strictly in the center of the light, and thumb downward represents red line under the light.

Table 1 Index of lability

Conditions	(1) Sitting in natural position		(2) Sitting straight up without plantar support		(3) Tip of the tongue firmly touching the central retro-incisor papillae		(4) Lips tightly serrated		(5) Tip of the tongue planted against the lower incisors		(6) Standing in a natural position		(7) Standing in a natural position with a foam insole
	h	H	O	H	h	H	h	H	O	H	O	H	O	O	No of the condition giving VO	Index of lability
Points for lability index	0		1		1		0		1		0		1		1	4

Note: Each time that the type of VH changes as a result of the stimulation of one sensor (when compared to the previous stimulation) gives 1 point.

Abbreviations: VH, vertical heterophoria; O, line in the middle of the light; h, line over the light; H, line under the light; VO, vertical orthophoria.