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 – what is, definition and treatment

What is Night Blindness and definition 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 […]

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Retinitis Pigmentosa – what is and treatment

Retinitis Pigmentosa definition 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 then […]

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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

Nystagmus definition 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 on […]

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Retinoblastoma – Definition and Treatment

Definition of Retinoblastoma Retinoblastoma is a cancerous tumor of the retina that most often occurs in children. Most retinoblastomas are hereditary and develop in early childhood, usually by age four. Some retinoblastomas are the result of new germline mutations though are not hereditary. Treatment in such cases is surgery to remove the eye (enucleation), with placement of […]

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Blepharitis and causes

Definition of Blepharitis Blepharitis is inflammation of the eyelids. the most common causes are infection and irritation. Anterior blepharitis is inflammination of the outer surface of the eyelid, typically along the rim at the base of the eyelashes. Posterior blepharitis affects the inner surface of the eyelid, typically resulting from blocked oil glands (meibomian glands) along the eyelid. Symptoms […]

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Exophthalmos – Bulging Outward of The Eye

Definition of Exophthalmos Exophthalmos – bulging outward of the eye, sometimes called poptosis. Most exophthalmos results from Graves’s disease and is a classic symptom of this form of hyperthyroidism. Thyroidrelated exophthalmos results from swelling of the tissues around the eye and within the orbit that develops in reaction to the high levels of thyroid hormone present in […]

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Ocular Herpes Simplex

What is Ocular Herpes Simplex and definition 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 […]

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