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H

Haab's Striae

hobbz stry' ay

When the pressure in the eye is high due to glaucoma or other causes, sometimes the cornea can be hazy. If the pressure is lowered, the cornea usually becomes clear again and small ‘cracks’ on the inside surface of the cornea form. These cracks are called Haab’s Striae and do not usually affect vision.

Additional keywords and misspellings:
hobbs corneal cracks

Hamartoma
An abnormal growth or malformaiton of tissue normally found in that site.
Hemeralopia
Day blindness
Hemianopia
The loss of about one-half of the visual field.
Heterochromia Iridis
A difference in color of the irides or of one iris.
Heterophoria
The tendency of the eyes to deviate.
Heterotropia
A manifest deviation of the eye in any direction in which binocular fixation is impossible.
Hippus
The spontaneous rhythmic movements of the iris.
Hordeolum (external)
An infection of the glands of Moll or Zeis; stye.
Hordeolum (internal)
A Meibomian gland infection.
Hyalitis
An inflammation of the vitreous body.
Hydrophthalmia
A marked enlargement of the eye from glaucoma; also called hydrophthalmos.
Hypermetropia
Hyperopia
Hyperopia

(hy-per-OH-pee-yah)

Hyperopia ("Farsightedness") occurs when an eye is too short for the cornea's curvature. As a result, light rays entering the eye focus behind the retina instead of precisely on the retina, and a blurred image is produced. A person with hyperopia cannot see distant objects clearly.

hyperopia

Additional keywords and misspellings:
hyperopea farsighted

Hypertension (high blood pressure)

hy per TEN shun

Hypertension, or high blood pressure, is a disease that can have serious effects on many parts of the body, including the eyes. Hypertension causes damage to the tiny and fragile blood vessels that feed the retina.

What can be done?
To reduce the risk of hypertensive eye disease, regular examinations by a physician are needed to monitor the condition. Hypertension must be controlled as much as possible and the key to control is to follow the advice of your physician.

Additional keywords and misspellings:
eye pressure high blood pressure hipertension hypertenson

Hypertropia
A manifest upward deviation of the eyes.
Hyphema

hy FEE' mah

Definition:
The buildup of fluid (blood) & pressure in the anterior chamber of the eye, following a blunt trauma or a systemic blood disorder such as sickle cell anemia or hemophilia . Blood in the anterior chamber is not harmful unless it is excessive enough to damage the adjacent trabecular meshwork and obstruct the outflow of aqueous humor, which can result in late glaucoma.

What are the symptoms?
Blurred vision, pain, light sensitivity and excessive watering of the eye.

What is the treatment?
Thorough examination of the structures of the eye is important. An X-ray or CT scan may be performed to rule out a fracture if it was caused by blunt trauma. Steroids and topical beta-blockers may be prescribed to reduce pressure in the eye; acetaminophen is used to manage pain since aspirin and ibuprofen can increase the amount of bleeding.

Additional keywords and misspellings:
hyphemia hiphema hiphemia hypema hifema

Hypophoria
A tendency of the eyes to deviate downward.
Hypopyon
Pus in the anterior chamber.
 
The Eye Encyclopedia is a collection of eye care terminology created by practicing optometrists and ophthalmologists. The information provided is not intended to be a substitute for regular medical care or to diagnose or treat any medical condition, and should be used only as a supplemental source of information. Please consult your doctor if you have any questions or concerns about your eye health.