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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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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Slit Lamp Examination

Definition of Slit Lamp Examination Slit Lamp Examination is the examination of the outer eye using a bright light focused into an elongated slit in combination with a biomicroscope. The examination takes place in a darkened room, with the person sitting on one side of the slit lamp and the ophthalmologist on the other side. The ophthalmologist moves […]

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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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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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Strabismus (tropia) – Causes, Treatment and Surgery

Definition of Strabismus Strabismus (tropia) is a condition, also called tropia, in which the eyes do not focus simultaneously on the same object. One eye may turn inward (“crosseye” or esotropia), or one eye may turn outward (“walleye” or exotropia). Congenital strabismus may occur with retinoblastoma or retinopathy of prematurity and becomes apparent in the first few months after birth. Most strabismus […]

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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 Zoster

Definition of Ocular Herpes Zoster 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 […]

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Toxic Optic Neuropathy – symptoms and treatment

Definition of Toxic Optic Neuropathy Toxic Optic Neuropathy – damage to the optic nerve, retina, and other structures of the eye as a side effect of medications or exposure to environmental or systemic toxins. Many substances can harm vision, and any substance that is a neurotoxin (damaging to the nervous system) has the potential to damage the optic nerve. Long-term […]

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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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