Applied Pathophysiology: Visual Function Changes
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Questions and Answers

What is the name of the condition in which the lens of the eye loses its elasticity and cannot accommodate for near vision?

  • Astigmatism
  • Hyperopia
  • Presbyopia (correct)
  • Myopia
  • Glaucoma is characterized by a buildup of pressure in the eye that can damage the optic nerve.

    True (A)

    What is the medical term for earwax?

    Cerumen

    The _______ is a fluid-filled chamber in the inner ear that plays a crucial role in hearing.

    <p>cochlea</p> Signup and view all the answers

    Match the following terms related to vision and hearing with their definitions:

    <p>Myopia = Nearsightedness; difficulty seeing distant objects Hyperopia = Farsightedness; difficulty seeing near objects Otitis media = Inflammation of the middle ear Presbycusis = Age-related hearing loss</p> Signup and view all the answers

    Which of the following is NOT a correction for myopia?

    <p>biconvex lens (B)</p> Signup and view all the answers

    Astigmatism is caused by an uneven curvature of the cornea or the lens.

    <p>True (A)</p> Signup and view all the answers

    What is the condition called when a person has difficulty focusing on near objects due to aging?

    <p>Presbyopia</p> Signup and view all the answers

    The term for "crossed eyes" is ______.

    <p>Strabismus</p> Signup and view all the answers

    Match the following eye conditions with their descriptions:

    <p>Myopia = Difficulty focusing on distant objects Hyperopia = Difficulty focusing on near objects Presbyopia = Age-related difficulty focusing on near objects Astigmatism = Blurred vision due to uneven curvature of the cornea or lens</p> Signup and view all the answers

    Which of the following is NOT a common cause of conductive hearing loss?

    <p>Inflammation of the inner ear (D)</p> Signup and view all the answers

    Otitis externa, commonly known as swimmer's ear, is an inflammation of the middle ear.

    <p>False (B)</p> Signup and view all the answers

    What is the name of the condition characterized by an abnormal patency of the Eustachian tube, leading to fluid movement from the nasopharynx into the middle ear?

    <p>Eustachian tube dysfunction</p> Signup and view all the answers

    Barotrauma is an injury caused by the inability of the ear to equalize ______ stress.

    <p>barometric</p> Signup and view all the answers

    The ______ conjunctiva lines the eyelids.

    <p>palpebral</p> Signup and view all the answers

    Match the following middle ear disorders with their descriptions:

    <p>Otitis media = Inflammation of the air cells in the mastoid bone Mastoiditis = Inflammation of the middle ear, often caused by a sore throat Otosclerosis = A slow formation of spongy bone at the oval window, leading to progressive hearing loss Barotrauma = Injury resulting from the inability to equalize barometric pressure</p> Signup and view all the answers

    Bacterial conjunctivitis is not contagious.

    <p>False (B)</p> Signup and view all the answers

    Which of the following is NOT a cause of conjunctivitis?

    <p>Fungal (A)</p> Signup and view all the answers

    Match the type of conjunctivitis with its typical characteristics.

    <p>Viral = Usually affects only one eye, excessive eye watering, small amount of discharge Bacterial = Usually affects both eyes, heavy discharge Allergic = Usually affects both eyes, itching, redness, excessive tearing</p> Signup and view all the answers

    What is the medical term for "pink eye"?

    <p>Conjunctivitis</p> Signup and view all the answers

    The bulbar conjunctiva covers the cornea.

    <p>False (B)</p> Signup and view all the answers

    What is the main protein component of the lens that can clump together causing a cataract?

    <p>Crystallin</p> Signup and view all the answers

    What is the main way a cataract affects vision?

    <p>It scatters incoming light, altering vision focus (C)</p> Signup and view all the answers

    Conductive hearing loss is always permanent.

    <p>False (B)</p> Signup and view all the answers

    Which of the following is NOT a type of taste disorder?

    <p>Anosmia (A)</p> Signup and view all the answers

    The medical term for a decrease in taste sensation is ______.

    <p>hypogeusia</p> Signup and view all the answers

    Match the following terms related to alterations in smell with their definitions.

    <p>Hyposmia = Impaired sense of smell Anosmia = Absence of smell Hallucinations = Hyperactivity of cortical neurons, resulting in olfactory illusions Parosmia = Abnormal or perverted sense of smell</p> Signup and view all the answers

    Explain the relationship between the sense of smell and the sense of taste.

    <p>The senses of smell and taste are closely linked. The olfactory receptors in the nose detect airborne chemicals that are dissolved in the nasal mucus, while taste receptors in the mouth detect chemicals dissolved in saliva. These combined inputs create the perception of flavor. Impairment of one sense can affect the other, as the brain relies on both to process flavor.</p> Signup and view all the answers

    Flashcards

    Myopia

    Nearsightedness; image focused in front of retina.

    Hyperopia

    Farsightedness; image focused behind the retina.

    Astigmatism

    Irregular lens curvature causing blurred vision.

    Presbyopia

    Age-related farsightedness due to lens rigidity.

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    Strabismus

    Misalignment of visual axes; inability to focus on one object.

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    Amblyopia

    Lazy eye; loss of visual detail due to eye misalignment.

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    Diplopia

    Double vision; perception of two images from one object.

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    Nystagmus

    Involuntary eye oscillation due to brain or inner ear dysfunction.

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    Conjunctiva

    Transparent mucous membrane that lubricates the eye.

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    Correction for Myopia

    Biconcave lens promotes divergence of light.

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    Palpebral conjunctiva

    The mucous membrane lining the eyelids.

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    Bulbar conjunctiva

    The mucous membrane covering the white part of the eyes.

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    Conjunctival sac

    Space between the palpebral and bulbar conjunctiva.

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    Conjunctivitis

    Inflammation of the conjunctiva, commonly known as 'pink eye'.

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    Viral conjunctivitis

    A type of conjunctivitis often affecting one eye, caused by a virus.

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    Bacterial conjunctivitis

    A contagious conjunctivitis affecting both eyes, causing heavy discharge.

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    Allergic conjunctivitis

    Conjunctivitis caused by allergens, affecting both eyes with itching and tearing.

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    Cataract

    Clouding of the lens, impairing focus by scattering light.

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    Altered Somatic Function

    Changes in the normal functioning of the body senses, affecting perception.

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    Special Sensory Function

    Functions of senses like vision and hearing, crucial for interacting with the environment.

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    Alterations in Vision

    Changes or impairments in the ability to see properly.

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    Alterations in Hearing

    Changes or issues that affect the ability to hear sounds.

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    Balance Disorders

    Issues with maintaining equilibrium that can affect movement and coordination.

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    Conductive hearing loss

    Hearing loss localized to the outer or middle ear, which can be temporary or permanent.

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    Sensorineural hearing loss

    A often permanent hearing loss caused by disease, trauma, or genetic defects in the cochlea nerve cells or auditory nerve.

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    Mixed hearing loss

    A combination of both sensorineural and conductive hearing loss.

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    Hyposmia

    Impaired sense of smell, often associated with aging or health issues.

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    Ageusia

    The absence of taste sensation, which impacts the quality of life but is not life-threatening.

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    Obstruction in Ear Canal

    Caused by cerumen accumulation or tumors that reduce sound movement to the middle ear.

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    Otitis externa

    An inflammation or infection of the outer ear canal, also known as swimmer's ear.

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    Eustachian Tube Dysfunction

    A condition where the Eustachian tube does not equalize pressure, causing fluid to enter the middle ear.

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    Barotrauma

    Injury to the ear from failure to equalize barometric stress, often during air travel or diving.

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    Otitis media

    Infection of the middle ear often caused by sore throat, common in children, may need antibiotics.

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    Mastoiditis

    Bacterial infection causing inflammation of the mastoid air cells, often a complication of otitis media.

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    Tinnitus

    A symptom characterized by the perception of noise like ringing or buzzing in the ears without external noise.

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    Ménière Disease

    A disorder causing severe vertigo and sensorineural hearing loss due to endolymph overproduction.

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    Study Notes

    Applied Pathophysiology: A Conceptual Approach to the Mechanisms of Disease

    • This lecture series covers applied pathophysiology, a conceptual approach to the mechanisms of disease.
    • The modules and chapters cover various topics related to disease.
    • The author is Dr. Romeo Batacan Jr.
    • The lecture series is part of the MPAT12001 Medical Pathophysiology Lecture Series.

    Alterations in Visual Function: Errors in Refraction

    • Myopia (nearsightedness):
      • Eye focuses image in front of retina.
      • Correction: biconcave lens to diverge light.
    • Hyperopia (farsightedness):
      • Eye focuses image behind retina.
      • Correction: biconvex lens to converge light.
    • Astigmatism:
      • Irregular curvature of lens.
      • Prevents image focusing, causing blurry vision.
      • Caused by corneal scar or scattering of crystalline lens.
      • Correction: glasses, contact lenses, or surgery.
    • Presbyopia:
      • Age-related farsightedness.
      • Ciliary muscle and lens lose ability to accommodate for near vision.
      • Correction: bifocals.

    Alterations in Visual Function: Alterations in Eye Movement

    • Strabismus ("crossed eyes"):
      • Misalignment of visual axes.
      • Inability to focus on single object.
      • Lack of coordinated extraocular muscle function for alignment.
    • Amblyopia ("lazy eye"):
      • Loss of visual detail from uncoordinated eye movement and focus.
      • Visual axes misalignment in children.
      • Avoidance of diplopia (double vision) by the brain suppressing one image.
      • Visual impairment of ignored eye can range from dimness to permanent loss.
    • Diplopia:
      • Perception of two images of a single object.
      • Images fall on non-corresponding areas of retina.
      • May result from strabismus.
      • Lack of extraocular muscle coordination.

    Alterations in Visual Function: Alterations in Protective Structures

    • Conjunctiva: a transparent mucous membrane that produces lubricating mucous secretions.
      • Palpebral conjunctiva: lines eyelids.
      • Bulbar conjunctiva: covers white of eyes.
    • Conjunctivitis (“pink eye”):
      • Inflammation of the mucous membrane lining the eye.
      • Causes include viral, bacterial, and allergic factors.
    • Cataract:
      • Clouding of the lens.
      • Altering vision focus by scattering incoming light.
      • Protein component of lens (crystallin) clumps or aggregates.
      • Increasing opaque area leads to vision impairment.

    Alterations in Hearing and Balance

    • Conductive hearing loss:

      • Obstruction (e.g., cerumen).
      • Trauma.
      • Inflammation (e.g., otitis externa).
    • Otitis media:

      • Inflammation of the middle ear.
      • Common cause of hearing loss in children
      • Myringotomy may be a treatment to relieve pressure
    • Mastoiditis:

      • Bacterial infection in middle ear air cells.
      • Often a complication of otitis media.
    • Otosclerosis:

      • Autosomal-dominant condition causing progressive conductive hearing loss.
      • Slow bone formation at oval window.
    • Sensorineural hearing loss: inner ear dysfunction.

      • Cochlear hair cell damage (often irreversible).
      • Neural pathway damage (auditory nerve).
      • Factors include aging, trauma, tumors, infections, ototoxic drugs.
    • Tinnitus (inner ear):

      • Perception of ear or head noise.
      • Not caused by external stimuli.
    • Ménière disease:

      • Severe vertigo with sensorineural hearing loss and tinnitus due to inner ear endolymph imbalance.

    Chemical Senses

    • Smell (Olfaction) and Taste (Gustation):
      • Chemoreceptors detect chemical dissolved in solution
        • Smell: airborne chemicals; Taste: food chemicals.
      • Smell and taste strongly linked. If one is impaired, the other may be as well.
    • Taste Disorders: Not common.
      • Hypogeusia: reduced taste perception.
      • Ageusia: absence of taste perception.
      • Parageusia: distorted taste perception.
    • Smell Disorders: Few occur early in life
      • Hyposmia: weakened sense of smell.
      • Anosmia: inability to smell.

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    Description

    This quiz explores alterations in visual function related to applied pathophysiology as outlined in the MPAT12001 Medical Pathophysiology Lecture Series. It covers specific conditions such as myopia, hyperopia, astigmatism, and presbyopia, detailing their mechanisms and corrections. Designed for medical students and professionals, it enhances understanding of how diseases affect vision.

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