Dacryocystitis – Inflammation of the lacrimal (tear) ducts

Definition of Dacryocystitis Dacryocystitis – inflammation of the lacrimal (tear) ducts, typically the nasolacrimal ducts in the corners of the eye near the nose . Dacryocystitis develops when there is a blockage of the lacrimal duct, which may result from dacryostenosis (narrowing of the lacrimal duct), infection, or chronic irritation such as might occur with allergic rhinitis or allergic conjunctivitis. Can […]

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Myopia – Nearsightedness – Definition and Symptoms

Definition of Myopia Myopia is a refractive error commonly called nearsightedness, in which the eye has difficulty focusing on distant objects. Myopia results when the focal point of lightwaves entering the eye falls short of the retina, causing the images the retina registers to be blurred. The refractive error occurs because the distance from the front to the back […]

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Uveitis – Symptoms and Treatment

Definition of Uveitis Inflammation of the uveal structures of the eye, which include the iris, ciliary body, and choroid. Uveitis most commonly affects the front of the eye (anterior uveitis) though may involve specific segments of the eye or the uveal tract throughout the eye. Symptoms Symptoms can vary from mild to severe and may include blurred vision, photophobia (extreme […]

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Diplopia – Medical Term for Double Vision

Definition of Diplopia 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; diplopia […]

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Night Blindness – Definition and Treatment

Definition of Night Blindness Night Blindness – impaired dark adaptation resulting from slowed photochemical reactions in the rods, the specialized cells of the retina that perceive contrast and detect visual images in low light. Night blindness becomes increasingly common after middle age. The person with night blindness may be unable to see at all in dim light […]

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Vision Impairment – symptoms and treatment

Definition of Vision Impairment Vision Impairment – the uncorrectable loss of vision. About 12 million Americans have vision impairments that prevent them from participating in occupations and activities that have requirements or legal standards for visual acuity (the ability to see clearly) and visual field (the scope of peripheral vision). People who have functional vision, also called low vision, generally […]

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Dry Eye Syndrome – symptoms and treatment

Definition of Dry Eye Syndrome 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 a dry […]

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Nystagmus – Definition, Causes and Treatment

Definition of Nystagmus Nystagmus – involuntary movements of the eyes, usually rapid and repetitive. Nystagmus can be congenital or acquired; in either circumstance it is a symptom of underlying disorders rather than itself a condition. Nystagmus nearly always indicates vision impairment; if congenital, the impairment may improve or completely resolve with age. Vision impairment in adults depends […]

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Ectropion Loss of Elasticity or Control of Eyelid

Definition of Ectropion Ectropion – loss of elasticity or control of the eyelid, usually the lower eyelid, that causes it to sag away from the eye. Ectropion allows tears to overflow the lid rather than remaining in the eye. It also fails to protect the eye, and especially the cornea, permitting dryness and exposure to environmental particles […]

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Ocular Herpes Simplex

Definition of Ocular Herpes Simplex Ocular Herpes Simplex – an infection of the eyes with herpes simplex virus 1 (hsv-1), which causes cold sores, or herpes simplex virus 2 (HSV-2), which causes genital herpes. The virus spreads to the eye to cause the initial infection via contamination from contact with an existing herpes sore elsewhere on the […]

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