Table 4. Spatio-temporal distances of the first registered visual sensation.

Patient	Couch speed [cm/s]	Position 1 light sensation		Distance 1. light sensation to orbital roof
		time [s]	distance [mm]	time [s]	distance [mm]
1	0.047	107	50.3	34.7	16.3
2	0.049	88.5	43.4	114.5	56.1
3	0.027	301	81.3	61.4	16.6
4	0.046	171	78.7	38.8	17.8
5	0.045	19.5	8.8	33.4	15
6	0.034	55.5	18.9	122.7	41.7
7	0.045	128.5	57.8	78.8	35.5
8	0.045	65	29.3	61.2	27.5
9	0.022	29	6.4	201.2	443
10	0.045	12	5.4	57.9	26.1
			Max	201.2	56.1
			Min	33.4	15
			Av	80.5	29.7
			Med	61.3	26.8
			σ	52.5	14.2

Patient specific spatio-temporal distances between the first registered light sensation and the bony structure orbital roof are shown. The interval between the beginning of the radiation and the first VSs ranges from 12 s (5.4 mm) to 301 s (81,3 mm). The distance between the first VSs and the orbital roof ranged from 33,4 s (15 mm) to 201,2 s (56,1 mm). All measured distances of the first beam inducing a VSs are more than ½ beam width away from the orbital roof.