Final answer:
Fluorescein, rose bengal, and lissamine green are the dyes commonly used for demarcation of devitalized tissue in dry eye syndrome, with fluorescein being especially prominent for this application in ophthalmology.
Step-by-step explanation:
The dyes primarily used for demarcation of devitalized conjunctival epithelium seen in "dry eye" syndrome include fluorescein, rose bengal, and lissamine green. These dyes are used in ophthalmology to identify and evaluate the damage to the conjunctiva and cornea. Fluorescein dye, in particular, is extensively used for this purpose as it can highlight areas of the epithelium that have lost their vitality due to the lack of adequate tear film protection in dry eye conditions.
For instance, fluorescein, when applied to the eye, will stain areas where the epithelial barrier is compromised, allowing for precise demarcation of affected tissues. This is vital for diagnosing the extent of dry eye syndrome and for guiding further treatment. Its usage is not only limited to dry eyes but also extends to detecting corneal abrasions, ulcers, and assessing the fit and health of contact lenses.