Third eyelid Flashcards

1
Q

3rd eyelid shape

A

T-shaped hyaline or elastic cartilage skeleton covered by conjunctiva

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2
Q

What species have hyaline 3rd eyelids

A

Ruminants Dogs

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3
Q

What species have elastic 3rd eyelids

A

horse pig cat

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4
Q

What percentage of the aqueous portion of the tear film does the 3rd eyelid contribute

A

35%

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5
Q

What causes movement of the 3rd eyelid

A

contraction of the extrinsic muscles of the eye that retract the globe

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6
Q

What species can move their 3rd eyelid

A

Cat

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7
Q

Function of 3rd eyelid (4 of them)

A

Protection of cornea Production of aqueous portion of precorneal tear film Distribution of tear film Limited immunological activity

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8
Q

Encircling 3rd eyelid

A

Seen in cocker spaniels Surgery almost never necessary

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9
Q

Congenital diseases of the 3rd eyelid

A

*Encircling 3rd eyelid* Pigmentation Dermoids Eversion of the cartilage

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10
Q

Acquired diseases

A

Prolapse of the gland Eversion or inversion of cartilage Protrusion of third eyelid Follicular conjunctivitis Neoplasia Plasma cell infiltration Foreign bodies

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11
Q

Treatment for prolapse of the gland

A

prolapse gland is surgically replaced never remove 3rd eyelid

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12
Q

Eversion or inversion or cartilage

A

Usually cosmetic, not a clinical problem

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13
Q

Etiologies of protrusion of 3rd eyelid (8 of them)

A

Decreased orbital mass Decreased ocular mass Denervation Ocular pain encephalitis Conjunctivitis Idiopathic

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14
Q

Should you remove the 3rd eyelid

A

no

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15
Q

Follicular conjunctivitis

A

common in dogs Persistent mucoid discharge with hyperplastic follicles

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16
Q

Treatment of follicular conjunctivitis

A

Mild: antibiotic/steroids Other: removal of follicles mechanically with curved end of Bard-Parker handle

17
Q

Types of neoplasia

A

Lymphosarcoma, adenocarcinoma

18
Q

Treatment for neoplasia

A

aspirate or biopsy surgically excise

19
Q

Plasma cell infiltration

A

German Shepards associated chronic superficial keratitis

20
Q

Therapy for plasma cell infiltration

A

Corticosteroids usually prolonged

21
Q

Third eyelid flap as a bandage

A

does not have any healing properties overused and misused technique