Conjunctiva-Associated Lymphoid Tissue (CALT) is a critical component of the ocular immune system. It is part of the broader category known as Mucosa-Associated Lymphoid Tissue (MALT), which includes other tissues like gut-associated lymphoid tissue (GALT) and bronchus-associated lymphoid tissue (BALT). CALT plays a significant role in protecting the eye from infections and maintaining immune homeostasis.