Color Deficiency – vision impairment

Definition of Color Deficiency Color Deficiency a vision impairment in which the ability to distinguish certain, and rarely all, colors is impaired. Color deficiency represents a shortage of normal cones, the specialized cells on the retina that detect color. Cones contain photosensitive chemicals that react to red, green, or blue. The most common presentation of color deficiency, accounting for about […]

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Iritis – inflammation of the iris

Definition of Iritis Inflammation of the iris, the muscle surrounding the pupil of the eye – may develop as a result of infection, such as conjunctivitis that spreads to involve other structures of the eye. Iritis also occurs as part of the inflammatory process in autoimmune disorders such as rheumatoid arthritis. The Symptoms of Iritis Include Irritation and a “gritty” […]

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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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Conjunctivitis – Inflammation of The Conjunctiva

Definition of Conjunctivitis Conjunctivitis – an inflammation of the conjunctiva, or mucous tissue that lines the inside of the eyelids. There are many causes for conjunctivitis, commonly called pink eye, including infection (bacterial, viral, or fungal) and contact contamination such as due to pollen or substances in the air or on the fingers that irritate the tissues. Infectious conjunctivitis is highly […]

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Ischemic Optic Neuropathy – Damage Optic Nerve

Definition of Ischemic Optic Neuropathy Damage to the optic nerve resulting from insufficient blood supply, sometimes called “stroke” of the optic nerve. Ischemic optic neuropathy is occurs most commonly in people over age 55 and causes mild to complete vision impairment. There are two forms: arteritic, associated with giant-cell arteritis (an inflammatory disorder of the arteries that typically affects […]

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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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Corneal Injury – Lacerations, Punctures, and Blunt Trauma to The Cornea

Definition of Corneal Injury Corneal Injury – lacerations, punctures, and blunt trauma to the cornea. because of its position, somewhat protruding at the front of the eye, the cornea is at risk for damage that can jeopardize vision. Corneal injuries require immediate medical attention. Any puncture or penetrating wound to the eye is a medical emergency. Loosely patch […]

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Keratitis – Symptoms, Treatment and Causes

Definition of Keratitis 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 Include redness and irritation of the eye and conjunctiva (inner eyelids) discomfort or pain excessive tearing difficulty keeping the eye open diminished visual acuity (usually blurred […]

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Retinopathy – Forms, Symptoms and Treatment

Definition of Retinopathy Dysfunction 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 to […]

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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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