Members of the DEWS Definition and Classification. Subcommittee developed a contemporary definition of dry eye disease and a three-. part classification system based on etiology, causative mechanisms and disease. severity.
Metaplasia. Definition: Metaplasia is the reversible replacement of one differentiated cell type with another differentiated cell type. Metaplasia causes precursor cells to change their cell fate, and do not change existing differentiated cells.he most common epithelial metaplasia is columnar to squamous (squamous metaplasia), as occurs in the respiratory tract in response to chronic irritation.
metaplasia. the change in the type of adult cells in a tissue to a form abnormal for that tissue. adj., adj metaplasÂ´tic. agnogenic myeloid metaplasia the primary or idiopathic form of myeloid metaplasia, which is often accompanied by myelofibrosis; it is considered one of the myeloproliferative disorders.yeloid metaplasia the occurrence of myeloid tissue in extramedullary sites; specifically, a syndrome characterized by splenomegaly, anemia, nucleated erythrocytes and immature granulocytes in the circulating blood, and extramedullary hematopoiesis in the liver and spleen.