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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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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Retinal Detachment – Symptoms, Treatment and Surgery

Definition of Retinal Detachment Separation of the retina from the choroid, the layer of the eye’s structure that nourishes and attaches the retina. Retinal detachment may occur as a result of trauma to the eye, age-related macular degeneration (armd), vitreous detachment, retinopathy of diabetes, or surgery on the eye. Retinal detachment may also occur spontaneously, a circumstance more common in people with moderate […]

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Astigmatism – Definition and Information

Definition of Astigmatism Common refractive error of vision that results from an irregularly shaped cornea. Astigmatism may affect one eye or both eyes. Typically the irregularity results in two focal points of light that reach the retina instead of a single focal point, resulting in blurred or distorted images. Astigmatism often coexists with hyperopia (farsightedness) or myopia (nearsightedness) and tends to run in […]

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Entropion – Deformity of The Eyelid

Definition of Entropion Entropion – deformity of the eyelid in which the lip of the lid, including the eyelashes, curls inward toward the eye. Scarring that results from cicatricial pemphigoid (an autoimmune disorder in which painful blisters repeatedly form on the insides of the eyelids) or recurrent conjunctivitis (inflammation or infection of the inner lining of the eyelids) is a common […]

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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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Retinitis Pigmentosa – what is and treatment

Definition of Retinitis Pigmentosa Retinitis Pigmentosa is the collective term for a group of hereditary disorders that result in progressive loss of vision. Retinitis pigmentosa generally begins with diminished night vision, as the degeneration affects primarily the rods (photoreceptors responsible for vision in dim light and for peripheral vision). Eventually the condition progresses to rods, and […]

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Black Eye – Definition, Symptoms and Treatment

Definition of Black Eye and Symptoms Black Eye – bleeding into the tissues around the eye resulting from trauma to the area, such as a blow or surgical operation. As with any other bruise, the bleeding causes swelling and discoloration. The most significant concerns with a black eye are damage to the eye or fractures of the orbital […]

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Episcleritis – Eye Inflammation

Definition of Episcleritis Episcleritis – inflammation of the episclera, the membrane that covers the sclera (fibrous outer layer, the “white,” of the eye). Most episcleritis is idiopathic (occurs for unknown reasons), though the condition sometimes accompanies autoimmune disorders such as rheumatoid arthritis and reiter’s syndrome. Episodes are self-limiting though may recur over time, with each episode of inflammation generally […]

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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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