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Infiltrative keratitis (IK) is an indicator of a cornea responding to inflammatory stimuli. It is rarely seen in rigid gas-permeable lenses or daily disposable lenses. In its mildest form it is asymptomatic (AIK).
How do I see it?
With a slit lamp using a parallelepiped system, with moderate illumination (if too high, faint infiltrates can 'bleach out') and 16X magnification. Indirect or indirect retro-illumination gives best results. Turn the room light down to enhance contrast and view against a dark iris or the pupil. Infiltrates appear as small, pale grey, fuzzy-edged spots near Bowman's layer. There is no loss of corneal thickness. Instil fluorescein and check with blue light and a yellow barrier filter.
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