Previously, we reported that a diagnosis of ocular sarcoidosis based on a CD4/CD8 ratio among vitreous-infiltrating lymphocytes greater than 3.5 had a sensitivity of 100% and a specificity of 96.3%.[9] Both of these values are remarkably higher than those for diagnoses based on BALF examinations.[9] Indeed, our present results indicated that the CD4/CD8 ratio in VLF was higher than in BALF. Here, CD4 is linked to ocular sarcoidosis.