Among mediators with competitive effects greater than 15%, increased levels of IL-12 subunit B (Proportion = −16.22%, 95% CI: −13.74–−18.62) and CD6 (Proportion = −17.87%, 95% CI: −15.36–−20.44) competitively inhibited the protective effect of FSC-A on CD8+ T cells against OM. Here, CD8A is linked to ocular melanoma.