BDNF and glaucoma: Both BDNF and NGF serum levels were not statistically related to RNFL thickness in the whole glaucoma sample (BDNF/RNFL r2 = 0.0002, p = 0.9; NGF/RNFL r2 = 0.01, p = 0.48) and RNFL thickness was not statistically related to age (r2 = 0.01, p = 0.44).