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.
Benign prostatic hyperplasia (BPH) is noncancerous cell growth of the prostate gland. It is the most common noncancerous form of cell growth in men and usually begins with microscopic nodules in younger men. BPH is not a precancerous condition and does not lead to prostate cancer.