This is a longitudinal natural history study to evaluate and study the immunologic changes to the ocular surface in cancer patients.~Two groups of subjects will be recruited for the study: 1) Pre-bone marrow transplant cancer patients. They will be evaluated every 3 months for 2 years.2) Normal control patients. They will be evaluated every 6 months for the duration of the study.~During each study visit, in addition to standard of care exams, certain biological specimens ( ocular surface wash, mucocellular material, corneal filaments, or impression cytology of conjunctiva, blood, or serum) will be collected.
Evaluate and study the immunologic changes to the ocular surface in cancer patients.