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A small yellow bird with a prominent white eye ring surrounding a dark eye. The underparts and head are yellow, with a black loral stripe, black bill, the flight and tail feathers are brown edged with yellowish olive. Some subspecies are greener, especially those occurring in forest. Juveniles are darker. [6]
They may appear as spots, threads, or fragments of "cobwebs", which float slowly before the observer's eyes, and move especially in the direction the eyes move. [3] As these objects exist within the eye itself, they are not optical illusions but are entoptic phenomena (caused by the eye itself).
Jaundice, also known as icterus, is a yellowish or greenish pigmentation of the skin and sclera due to high bilirubin levels. [3] [6] Jaundice in adults is typically a sign indicating the presence of underlying diseases involving abnormal heme metabolism, liver dysfunction, or biliary-tract obstruction. [7]
The Black Prism is a fantasy novel by American author Brent Weeks. It is the first book in the five-volume [ 1 ] Lightbringer Series and follows Gavin Guile, known as the 'Prism' and the most powerful person in the world, [ 2 ] as he combats an uprising led by a self-proclaimed king.
Angular cheilitis is thought to be a multifactorial disorder of infectious origin, [10] with many local and systemic predisposing factors. [11] The sores in angular cheilitis are often infected with fungi (yeasts), bacteria, or a combination thereof; [8] this may represent a secondary, opportunistic infection by these pathogens.
Visual snow syndrome (VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or colored dots across the whole visual field.
Whatever the body colour, this species has red eyes. The colour of juveniles can be more mottled than in adults. As they mature their silvery body becomes less mottled and changes to a darker grey or black colour. How dark the fish become depends on the local water conditions; fish in Peru appear to be the darkest and may be almost jet black. [2]
Prisms are sometimes used for the internal reflection at the surfaces rather than for dispersion. If light inside the prism hits one of the surfaces at a sufficiently steep angle, total internal reflection occurs and all of the light is reflected. This makes a prism a useful substitute for a mirror in some situations.