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When a client reports losing full or partial vision in one or both eyes, the nurse can usually anticipate a _____ as the cause.
lesion
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Source is lesion in (right) eye or (right) optic nerve
Unilateral blindness
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Source is lesion of optic chiasm
Bitemporal hemianopia (loss of vision in both temporal fields)
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Source is Partial lesion of temporal loop (optic radiation)
- Left superior quadrant anopia or similar loss of vision (homonymous) in
- quadrant of each field
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Source is Lesion in right optic tract or lesion in temporal loop (optic radiation)
- Right visual field loss—right homonymous hemianopia or similar loss of
- vision in half of each field
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Normal in young children, the pupils will appear at the inner canthus (due to the epicanthic fold)
Pseudostrabismus
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A constant malalignment of the eye axis and is defined according to the direction toward which the eye drifts and may cause amblyopia
Strabismus (or Tropia)
- Esotropia (eye turns inward)
- Exotropia (eye turns outward)
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Noticeable only with the cover test, this is less likely to cause amblyopia than strabismus.
Phoria (mild weakness)
Esophoria is an inward drift and exophoria an outward drift of the eye.
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Noticeable with the positions test, ____________ is usually the result of weakness or paralysis of one or more extraocular muscles.
paralytic strabismus
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(Paralytic Strabismus)
________ paralysis: The eye cannot look to the outer side
6th nerve
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(Paralytic Strabismus)
__________ paralysis: The eye cannot look down when turned inward
4th nerve
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outwardly turned lower lid
Ectropion
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generalized inflammation of the conjunctiva
Conjunctivitis
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protruding eyeballs and retracted eyelids
Exophthalmos
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infected meibomian gland
Chalazion
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inwardly turned lower eyelid
Entropion
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staphylococcal infection of the eyelid
Blepharitis
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inflammation of the sclera
Diffuse episcleritis
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bright red areas of the sclera
Subconjunctival Hemmorhage
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A corneal _____, which appears grayish-white, usually due to an old injury or inflammation
scar
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Early __________, a thickening of the bulbar conjunctiva that extends across the nasal side
pterygium
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____________ appear gray when seen with a flashlight; they appear as a black spot against the red reflex when seen through an ophthalmoscope.
Nuclear cataracts
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____________ look like gray spokes that point inward when seen with a flashlight; they look like black spokes that point inward against the red reflex when seen through an ophthalmoscope
Peripheral cataracts
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An ____________ iris causes a shallow anterior chamber, which may increase the risk for narrow-angle (closed-angle) glaucoma.
irregularly shaped
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Also known as pinpoint pupils, miosis is characterized by constricted and fixed pupils—possibly a result of narcotic drugs or brain damage.
Miosis
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_________ is pupils of unequal size. In some cases, the condition is normal; in other cases, it is abnormal.
Anisocoria
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Dilated and fixed pupils, typically resulting from central nervous system injury, circulatory collapse, or deep anesthesia.
Mydriasis
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• Swollen optic disc
• Blurred margins
• Hyperemic appearance from accumulation of excess blood
• Visible and numerous disc vessels
• Lack of visible physiologic cup
Papilledema
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• Enlarged physiologic cup occupying more than half of the disc’s
diameter
• Pale base of enlarged physiologic cup
• Obscured and/or displaced retinal
vessels
Glaucoma
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• White optic disc
• Lack of disc vessels
Optic Atrophy
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• Also known as soft exudates; have a fluffy cotton ball appearance, with irregular edges.
• Appear as white or gray moderately sized spots on retinal background
• Caused by arteriole microinfarction
• Associated with diabetes mellitus and hypertension
Cotton wool patches
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• Solid, smooth surface and well-defined edges
• Creamy yellow-white, small, round spots typically clustered in circular,
linear, or star pattern
• Associated with diabetes mellitus and hypertension
Hard Exudate
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• Appear as small, flame-shaped, linear red streaks on retinal background
• Hypertension and papilledema are common causes.
Superficial (flame-shaped) retinal hemmorhages
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• Appear as small, irregular red spots with blurred edges on retinal background
• Lie deeper in retina than superficial retinal hemorrhages
• Associated with diabetes mellitus
Deep (dot-shaped) retinal hemmorhages
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• Round, tiny red dots with smooth edges on retinal background
• Localized dilations of small vessels in retina, but vessels are too small to see
• Associated with diabetic retinopathy
Microaneurysms
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