82 5 The Morphology of Thygeson’s Superfi cial Punctate Keratitis (TSPK)

Fluorescein Sodium Staining of TSPK Epithelial Lesions

a b

Fig. 5.5 (a) shows the light-reflecting property of a TSPK lesion. In (b) is visible circumscript green staining (partly confluent green dots; short arrow) indicating focal surface disruptions and penetration of fluorescein stained tear fluid into semi-cystic spaces. The periphery of the lesion is elevated (dark; bowed arrow); cf. also Figs. 5.6 below and 5.7, opposite page

Fig. 5.6 (a, b) A TSPK lesion. (a) Without staining, it appears granular. (b) Circumscript fluorescein staining indicating fluid penetration into semi-cystic spaces (partly confluent green dots; short arrow); the periphery of the lesion is elevated (dark; bowed arrow)

Comment

For further examples of fluorescein staining see Cases; the yellow (adherent) fluorescein staining is shown in Figs.

6.9, 6.14, and 7.2