Welch Allyn PanOptic 118 Series - Cobalt Blue Filter; Half-Moon Aperture

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relatively blue, but oxygenated arterial blood makes arteries
appear blacker. This greater contrast makes differentiation
easier for the examiner.
6. Cobalt Blue Filter (Model 11820 only): In conjunction
with fluorescein dye applied topically to the cornea
and an add-on magnifying lens (included), this filter is
helpful in detecting corneal abrasions and foreign
bodies. In this way, it can be used as a surrogate to a
Woods Light.
7. Half-Moon Aperture (11810 Only): Provides a
combination of depth perception and field-of view.