| fascicular keratitis | A phlyctenular keratitis followed by the formation of a band or fascicle of blood vessels extending from the margin toward the centre. (05 Mar 2000) |
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| filamentary keratitis | A condition characterised by the formation of epithelial filaments of varying size and length on the corneal surface. Synonym: keratitis filamentosa. (05 Mar 2000) |
| lagophthalmic keratitis | Inflammation of the cornea resulting from irritation caused by inability to close the eyelids. Synonym: lagophthalmic keratitis. (05 Mar 2000) |