A CD4 + T lymphocytes count below 100 cells/μL is associated with retinal or conjunctival microvasculopathy, Cytomegolovirus (CMV) retinitis, Varicella – Zoster Virus retinitis, cryptococcosis, microsporidiosis, HIV encephalopathy and progressive multifocal leuco-encephalopathy [2]. Here, CD4 is linked to cytomegalovirus retinitis.