Dacryostenosis – narrowing of the lacrimal (tear) duct

Definition Narrowing of the lacrimal (tear) duct, usually congenital, that blocks the flow of tears. An infant does not produce a great volume of tears during the first few weeks to months after birth, so the doctor may not suspect or diagnose dacryostenosis until the infant is three to four months of age. The most […]

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Keratitis – Symptoms, Treatment and Causes

Keratitis definition Keratitis is an INFLAMMATION of the CORNEA, usually the result of an INFECTION. The cause of the infection is more commonly viral, such as HERPES SIMPLEX or HERPES ZOSTER, than bacterial. Symptoms of infectious keratitis include redness and irritation of the EYE and conjunctiva (inner eyelids) discomfort or PAIN excessive tearing difficulty keeping the eye open diminished VISUAL […]

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Pterygium eye – surgery and treatment

Pterygium definition Growth arising from the conjunctival tissue around the perimeter of the EYE, usually on the side near the nose. A pterygium characteristically grows in a triangular shape, and has its own BLOOD supply to support its growth. Growth generally is slow. Often a pterygium remains innocuous, though some people experience irritation and a sensation of grittiness in […]

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Diplopia – medical term for double vision

What is Diplopia and definition Diplopia – the medical term for double vision, a circumstance in which a person perceives a single object as a two distinct images- can be vertical (images one above the other) or horizontal (images beside each other). Diplopia that is present when using both eyes and goes away when covering one EYE is binocular; […]

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Keratoconus – treatment

Keratoconus definition Keratoconus is a degenerative disorder in which the CORNEA thins, allowing it to protrude from the surface of the EYE in somewhat of a cone shape. Keratoconus affects both eyes though often progresses at different rates in each eye. Ophthalmologists do not know what causes keratoconus, though it appears to run in families. Keratoconus is painless […]

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Ptosis eye – definition

What is Ptosis and definition Ptosis – drooping of the upper eyelid – often is a consequence of MUSCLE weakness or neurologic damage, and is sometimes a symptom of a neurologic condition such as MYASTHENIA GRAVIS or MUSCULAR DYSTROPHY. Ptosis may be congenital (present at birth), the result of underdevelopment or absence of the levator muscle that raises […]

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Dry Eye Syndrome – symptoms and treatment

What is Dry Eye Syndrome and definition Dry Eye Syndrome is a condition in which the lacrimal (tear) glands do not produce enough tears or the tears evaporate too quickly, causing the EYE to become dry and irritated. Dry eye syndrome has numerous causes, the most common of which are aging, medication side effects, and extended exposure to […]

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Mydriasis – definition, causes and treatment

Mydriasis definition Mydriasis – excessive or persistent dilation of the pupil that is a symptom of ophthalmic or systemic conditions. The ophthalmologist may induce mydriasis, using topical atropine, to examine the inner EYE. Therapeutic mydriasis using atropinebased ophthalmic drops is an alternate treatment for AMBLYOPIA. Causes of Mydriasis Two eye conditions can cause mydriasis: GLAUCOMA and damage to the iris. In […]

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Refractive Errors of the eye – definition and types

Refractive Errors definition Vision disorders in which a defect of the EYE does not allow proper refraction of light. When the eye is longer than normal from front to rear, the lightwaves entering the eye focus short of the RETINA, resulting in MYOPIA (nearsightedness). When the eye is shorter, the lightwaves that enter the eye focus behind the retina, […]

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Amblyopia – Lazy Eye

Lazy eye (Amblyopia) definition VISION IMPAIRMENT, commonly called “lazy eye,” in which the pathways between the EYE and the BRAIN do not properly handle the processes of sight. Amblyopia is most common in children. The impairment often develops when there are circumstances that allow one eye to become dominant in sending NERVE impulses to the brain, such as STRABISMUS (the […]

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