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Eye Health Glossary

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haloes

Appearance of a halo, particularly around lights. This is a common complaint of patients with angle closure glaucoma and cataracts.

heterochromia

A relatively rare eye condition in which the eyes have different colors. Kate Bosworth, whose right eye is brown while her left eye is blue is an example. David Bowie also has heterochromia.

high index

For many people with high prescriptions, the unfortunate result was heavy, thick glasses, but with high index lenses, eyeglass lenses are becoming thinner and thinner. A high index of refraction enables greater bending of light through the glasses without the necessary curvature of the lenses, with the result that the lenses can be thinner and flatter.

hordeolum

Swollen nodule on the upper or lower eyelid due to infection. Often produces pain when pressed on. Learn more about Hordeolum.

hyperopia

Common refractive vision problem (aka. farsightedness) in which the focusing power of the eye is too weak such that an image comes to focus behind the retina. Hyperopia is corrected with convex (plus) lenses. Learn more about Hyperopia.

hypertropia

Misalignment of the eyes such that one eye is rotated slightly higher than the other eye.

hyphema

Occurrence of blood within the anterior chamber. Hyphema is often caused by blunt trauma injury where blood leaks into the anterior chamber.

hypotony

Abnormally low eye pressure. Usually characterized by an intraocular pressure (IOP) lower than 5 mmHg.

hypotropia

Misalignment of the eyes such that one eye is rotated slightly lower than the other eye.

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