halo (redirected from anthelion)

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.

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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.

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ha·lo (hl)

n. pl. ha·los or ha·loes

1. A reddish yellow ring surrounding the optic disk, caused by an expansion of the scleral ring that makes the deeper structures visible.

2. Glaucomatous halo.

3. A ring of light surrounding a luminous body.