Table 1.

Density of immunopositive neurons per microscopical vision field (700 × 420 μm)

Density	Number of fibers
0	No fibers found
1	1–10
2	11–20
3	21–30
4	31–40
5	41–50
6	51–60
7	61–70
8	71–80
9	81–90
10	>91