Retinoblastoma – what is, definition and treatment

Retinoblastoma definition 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. About 70 percent of retinoblastomas involve only one EYE. Treatment in such cases is surgery to remove […]

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Blepharitis and causes

Blepharitis definition 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 of […]

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Exophthalmos – bulging outward of the eye

What is Exophthalmos and definition 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 […]

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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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Retinopathy – forms, symptoms and treatment

What is Retinopathy Dysfunction – Definition Retinopathy is a dysfunction of the RETINA in which new BLOOD vessels grow across the retina’s surface. This growth causes the death of photoreceptors, the specialized cells (rods and cones) in the retina that receive lightwaves and convert them to nerve impulses for transmission to the brain. The blood vessels are also delicate and prone […]

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Blepharospasm and definition

Blepharospasm definition Blepharospasm – involuntary closure of the eyelid that results from dysfunction of or damage to the nerves that control the muscles of the eyelids. Episodes of closure may range from brief (a minute) to extended (several hours). Extended closure interferes with vision. Doctors do not know what causes blepharospasm, though it is a symptom […]

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Eye Pain – sensations discomfort involving eye

Eye pain definition Eye Pain – sensations discomfort involving the EYE and its supporting structures. Pain may vary from scratchy irritation to intense and debilitating pain. Much eye pain in the form of burning and itching arises from minor and treatable causes that affect the structures around the eye rather than the eye itself. Eye pain that is […]

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Ocular Herpes Zoster

Ocular Herpes Zoster definition Ocular Herpes Zoster – INFECTION of the eyes with the varicella zoster VIRUS, a member of the HERPES SIMPLEX family of viruses that causes CHICKENPOX and shingles. After the infectious stage of chickenpox subsides, the virus submerges itself in NERVE roots. It may reemerge years to decades later, erupting in a rash of painful blisters […]

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Retrobulbar Optic Neuritis – symptoms

Retrobulbar Optic Neuritis Definition Retrobulbar Optic Neuritis – INFLAMMATION of the OPTIC NERVE outside the globe of the EYE, between the eye and the brain. Retrobulbar optic neuritis can result from INFECTION such as MENINGITIS or ENCEPHALITIS, as a consequence of toxic exposure, and as a manifestation of MULTIPLE SCLEROSIS. Symptoms of Retrobulbar Optic Neuritis may include PAIN with eye movement […]

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