biochemical and haematological profile - Universitatea de Ştiinţe ...

Universitatea de Științe Agricole și Medicină Veterinară Iași
7. Diffuse corneal edema 8. Localized corneal edema
When it appears, corneal vascularization is always pathological. Blood vessels can be
superficial, deep or both. Superficial neovascularisation are „treelike” vesseles, originating in
conjunctival circulation. They occur whenever there is a lesion in the epithelium or the
anterior stroma. Deep vessels are short, parallel, „hedgelike”, originating in the cilliary
circulation. The depth of new formed vessels is a good indicator of the depth of the initiating
lesion. In cases of persistent or complicated lesions, a granulation tissue can occur. The
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dinamic of corneal neovascularisation is presented in photos 9‐14.
9.Superficial neovascularisation, cat. 10.Superficial vessels, cat. 11. Superficial vessels, dog.
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12. Granulation tissue, dog. 13. Granulation tissue, cat 14.Deep vascularisation, dog.
Corneal vascularisation is generally beneficial in stromal repair. Blood vessels advance from
the limbus, until they invade the lesion, corneal healing and regain of transparency starting
from the limbus, as it can be seen in photo 9. Keeping in mind those facts, although blood
vessels can result in influx of pigments and inflammatory cells, easing corneal fibrosis, control
if neovascularisation with the use of steroids is not always indicated.
Corneal pigmentation is also called pigmentary keratitis. These terms ignore the possibility of
other pigments, like hemoglobin or the soluble pigment in corneal sequestra in cats, than
melanin to cause corneal opacity. Nevertheless, it must not be used as a diagnosis, for it is only
a sign of chronic, persistent corneal irritation, that may have many causes, each with a
different treatment. Melanin is deposited in the epithelium and the anterior stroma, migrating
along with blood vessels, during the inflammatory process.
Corneal melanosis is a sign of chronic irritation, as seen in cases of eye exposure due to facial
nerve paralysis, lagophtalmos, frictional irritation (distichiasis, entropion) (photo. 15), tear film
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