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Vet Ophthalmol. 2000;3(2-3):133-137.

Cochet-Bonnet aesthesiometer-determined corneal sensitivity in neonatal foals and adult horses.

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  • 1Departments of Large and Small Animal Clinical Sciences, University of Florida, PO Box 100126, Gainesville, FL 32601, USA; Peterson and Smith Equine Hospital, 4747 SW 60 Ave, Ocala, FL 34474, USA.


Corneal touch threshold (CTT) was measured in sick neonatal foals, healthy foals, and healthy adult horses with a Cochet-Bonnet aesthesiometer. The mean overall CTT for the adult horses, sick foals, and healthy foals was 4.82 +/- 0.87 cm, 3.21 +/- 0.24 cm, and 5.01 +/- 0.61 cm, respectively. The central cornea of adult horses was more sensitive than the limbal cornea. Corneal sensitivity was significantly reduced in sick neonatal foals compared to adults. The mean Schirmer I tear test values were significantly lower in foals than adults, and were 14.2 +/- 1.0 mm, 12.8 +/- 2.4 mm, and 18.3 +/- 2.1 mm wetting in sick neonatal foals, normal neonatal foals, and adult horses, respectively. Reduced corneal sensation and lower tear production may be associated with ulcerative keratitis and slow corneal healing in some foals.

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