Questions and Answers
Contraction of the orbicularis oculi aids in movement of tears through the lacrimal canaliculi and nasolacrimal drainage system via the action of which section of the muscle?
What is the average upper eyelid excursion measurement in normal patients?
15 mm
Chronic blepharitis, if left untreated, can cause which of the following structural changes to the anterior segment of the eye?
Which 2 of the following glands are considered accessory lacrimal glands, producing a small portion of the aqueous component of the tears? (Select 2)
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Which of the following most accurately describes the meibomian glands?
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What is the CORRECT interpretation of findings during lacrimal irrigation when fluid is regurgitated through the puncta?
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Eyelid ptosis that occurs as a result of severe giant papillary conjunctivitis (GPC) can be classified as which type of blepharoptosis?
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Which systemic disorder is MOST commonly associated with the presence of yellow, soft, raised, plaque-like lesions in the medial canthal region of the eyelid?
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What is the ocular condition in which redundant upper lid skin is present, in association with skin laxity and loss of muscle tone?
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A common cause of epiphora in infants is due to a small membrane that covers over which structure?
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Study Notes
Contraction of the Orbicularis Oculi
- The Muscle of Horner assists in tear movement through the lacrimal canaliculi and nasolacrimal drainage system.
Levator Muscle Function
- Average upper eyelid excursion in normal patients is 15 mm.
Chronic Blepharitis Effects
- Madarosis can occur as a structural change in the anterior segment if chronic blepharitis is untreated.
Accessory Lacrimal Glands
- Glands of Krause and Glands of Wolfring are accessory lacrimal glands contributing to the aqueous component of tears.
Meibomian Glands Description
- Meibomian glands are classified as sebaceous glands producing the lipid layer of the tear film.
- Approximately 30-40 glands are found in the upper lid and 20-30 in the lower lid.
Lacrimal Irrigation Findings
- Difficulty during lacrimal irrigation indicates a blockage proximal to the common canaliculus.
Eyelid Ptosis Classification
- Eyelid ptosis from severe giant papillary conjunctivitis (GPC) is classified as mechanical.
Xanthelasma Association
- Hyperlipidemia is the systemic disorder most commonly associated with xanthelasma, characterized by yellowish, raised lesions on the eyelids.
Dermatochalasis
- Dermatochalasis is identified by redundant upper lid skin due to skin laxity and muscle tone loss.
Epiphora in Infants
- A common cause of epiphora in infants is a membrane covering the valve of Hasner, which often resolves spontaneously within the first year of life.
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Description
Test your knowledge on the contraction of the orbicularis oculi and its role in eye movement and tear drainage. This quiz will help you understand the functions of various ocular muscles, including the Muscle of Horner and the levator muscle. Perfect for students and professionals in the medical field.
