Slit-lamp biomicroscopy provides brilliant illumination and high magnification, revealing subtle pathological changes that suggest or corroborate provisional diagnoses. This technique is not difficult and can be mastered quickly.
The detection of dry eye syndrome prior to blepharoplasty should alert the surgeon to the possibility of painful post-operative exposure keratitis if lid closure is interfered with.
Visualization of pathological features allows almost certain diagnosis of small basal cell carcinomas, and better appreciation of the true extent of the neoplasm for planning excisional margins. Certain oculocutaneous syndromes can be diagnosed and involvement of ocular adnexal and periocular tissues can be appreciated prior to facial plastic surgery.