halo


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halo

 [ha´lo]
a circular structure, such as a luminous circle seen surrounding an object or light.
Fick's halo a colored circle appearing around a light, experienced by wearers of contact lenses.
halo glaucomato´sus (glaucomatous halo) a narrow light zone surrounding the optic disk in glaucoma.
senile halo a zone of variable width around the optic disk, due to exposure of various elements of the choroid as a result of senile atrophy of the pigmented epithelium.

ha·lo

(hā'lō),
1. A reddish yellow ring surrounding the optic disc, due to a widening of the scleral ring making the deeper structures visible.
2. An anular flare of light surrounding a luminous body or a depigmented ring around a mole.
3. Synonym(s): areola (4)
4. A circular metal band used in a halo cast or halo brace, attached to the skull with pins.
[G. halōs, threshing floor on which oxen trod a circle; the halo round the sun or moon]

halo

/ha·lo/ (ha´lo)
1. a luminous or colored circle, as the colored circle seen around a light in glaucoma.
2. a ring seen around the macula lutea in ophthalmoscopic examinations.
3. the imprint of the ciliary processes on the vitreous body.
4. a metal or plastic band that encircles the head or neck, providing support and stability to an orthosis.

Fick's halo  a colored circle appearing around a light due to the wearing of contact lenses.
halo glaucomato´sus , glaucomatous halo peripapillary atrophy seen in severe or chronic glaucoma.
senile halo  a zone of variable width around the optic papilla, due to exposure of various elements of the choroid as a result of senile atrophy of the pigmented epithelium.

ha·lo

(hā'lō)
1. A reddish yellow ring surrounding the optic disc, due to a widening of the scleral ring making the deeper structures visible.
2. An anular flare of light surrounding a luminous body or a depigmented ring around a mole.
See: halo nevus
3. Synonym(s): areola (4) .
4. A circular metal band used in a halo cast or halo brace, attached to the skull with pins.
[G. halōs, threshing floor on which oxen trod a circle; the halo round the sun or moon]

halo

A coloured ring of light seen around a light source as a result of aberrations, internal reflections, diffraction or scattering. It also appears when the eye is diseased and the cornea is oedematous, as in glaucoma.
References in classic literature ?
And, mad as it sounds, because the halos and the name of God in the old missals were of real gold; these also were taken away.
It was not actually raining, but each gas lamp had a rusty little halo of mist.
The fruiterer at the corner had put out the blazing glory of his oranges and lemons, and Brett Place was all darkness, interspersed with the misty halos of the few lamps defining its triangular shape, with a cluster of three lights on one stand in the middle.
And Jukes heard the voice of his commander hardly any louder than before, but nearer, as though, starting to march athwart the prodigious rush of the hurricane, it had approached him, bearing that strange effect of quietness like the serene glow of a halo.
Approaching nearer and nearer yet, this halo began to fade, and the causes which produced it slowly to develop themselves.
And you come, brother,' said Mr Wegg, in a hospitable glow, 'you come like I don't know what--exactly like it--I shouldn't know you from it--shedding a halo all around you.
Get ready for deployment with Halo Wars soon launching in the Middle EastOne of the most anticipated strategy games for 2009Microsoft Game Studios and Ensemble Studios announced that the much-anticipated strategy game Halo Wars will be landing at retailers in Middle East this February in both Standard and Limited Collector's Edition format.
But studies over the past decade had indicated that stars in Andromeda's halo were abundant in elements heavier than hydrogen.
Halo died Tuesday in his paddock at Arthur Hancock's Stone Farm in Paris, Ky.
The Halo UVX is the only vacuum that "Cleans what you see, Kills what you can't[TM].
Created and manufactured in the USA, Halo and Halo WX are the first smoke alarms of their kind, combining multi-layered sensor technology to detect flash fires, smoldering fires, and carbon monoxide.