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Ophthalmology > Colours Of The Cornea > Flashcards

Colours Of The Cornea Flashcards

1
Q

What four main colour changes can affect the cornea?

A
  1. Red/Pink
  2. White
  3. Blue
  4. Brown/Black
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2
Q

What are the potential causes of a red cornea?

A

Irritation
LPI
Feline eosinophillic keratitis
KCS

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3
Q

Give examples of corneal irritation.

A

Entropion
Ectropion
Triachiasis
Distichasis

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4
Q

What is LPI?

A

Canine Lymphocytic Plasmacytic Infiltration. Lymphocytes infiltrate the cornea alongside blood vessels beginning from the lateral/medial limbus.

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5
Q

How would you diagnose LPI?

A

Cytobrush after administration of proxymetacaine

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6
Q

What is the treatment for LPI?

A

Steroid or cyclosporin drops 6x daily

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7
Q

What is feline eosinophilic keratitis?

A

A disease with cluster of eosinophils appearing as pink/white clump infiltrates. It is also seen in horses and rabbits

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8
Q

How do you treat eosinophilic keratitis?

A

Steroid drops six times a day

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9
Q

What is KCS?

A

Keratoconjunctivitis Sicca AKA dry eye. Usually bilateral.

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10
Q

How would you diagnose KCS?

A

STT1

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11
Q

What is the treatment of KCS?

A

Cyclosporin drops, viscous tears +/- chloramphenicol drops

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12
Q

What are the possible causes of white corneas?

A

Lipid infiltrates
Calcium infiltrates
Corneal scarring
Corneal abcesses

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13
Q

How would lipid infiltrates appear?

A

Reflective white crystals in superficial stroma. If primary, no vascularisation is present.

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14
Q

How would calcium infiltrates appear?

A

Non-reflective white crystals in the superficial stroma.

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15
Q

What are the causes of a blue cornea?

A

Oedema - overhydration of the stroma

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16
Q

What are the causes of corneal oedema?

A 
Ulcer
Glaucoma/Uveitis
Lens luxation
Primary endothelial damage
Leaky vessels after vasularisation
17
Q

What are the causes of brown/black cornea?

A

Pigmentation

18
Q

How might pigmentation of the cornea occur?

A

Pigmentary keratitis associated with entropion.
Sequestra seen in cats
Scarring

Ophthalmology (9 decks)

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