Our previous studies on yoga and meditation and yoga-based lifestyle interventions have shown that they can modulate markers of stress in the serum (cortisol, interleukin-6, brain-derived neurotrophic factor (BDNF), DHEA, and reactive oxygen species) at 6–8 weeks post-intervention compared with the baseline on the assessment of glaucoma and retinoblastoma patients. Here, BDNF is linked to retinoblastoma.