Table 2.

Mean threshold levels and standard deviation (and median in parenthesis) of the Humphrey 60–4 visual field collage (combination of ‘normal’ and ‘20 degrees nasal fixation measurements) in each quadrant (superior-nasal, superior-temporal, inferior-nasal, inferior-temporal) in four age groups (n = number of individuals tested)

Age decade	SupNas	SupTemp	InfNas	InfTemp
30ies (n = 5)	311 ± 51 (298)	426 ± 52 (435)	343 ± 38 (349)	520 ± 84 (537)
50ies (n = 5)	264 ± 38 (277)	319 ± 54 (318)	220 ± 71 (212)	379 ± 83 (369)
70ies (n = 5)	185 ± 33 (174)	252 ± 69 (228)	161 ± 70 (145)	290 ± 65 (301)
90ies (n = 5)	69 ± 44 (75)	98 ± 50 (108)	68 ± 20 (58)	144 ± 13 (146)

For quadrant comparison one has to keep in mind, that the superior HVF measures only to 50 degrees due to the paucity of retinal ganglion cells in the inferior peripheral retina. Therefore, only nasal and temporal quadrants can be compared in the superior and inferior half respectively. Each neighbouring age group showed a significant decrease of the individual quadrants mean threshold level in the older age group