Correlation between corneal sensitivity and quantity of reflex tearing in cows, horses, goats, sheep, dogs, cats, rabbits, and guinea pigs

Abstract

The high variance and low reproducibility of results suggest that the measuring devices are inappropriate to assess the evaluated parameters. Therefore, no assured correlation between the corneal sensitivity and the quantity of reflex tearing could be found.

Corneal sensitivity in five horse breeds

“…Previous investigations have shown no significant differences between an individual's two eyes with respect to CTT evaluations (GOLEBIOWSKY et al, 2011;WIESER et al, 2013). Moreover, two measurement results per animal can hinder the degrees of freedom in the statistical model, leading to a reduction in statistical power, and the need for a higher caseload (GOLEBIOWSKY et al, 2011).…”

“…Esthesiometry has been studied in different species, including humans (GOLEBIOWSY et al, 2011), cats (CHANG-LING, 1989BLOCKER & VAN DER WOERT, 2001;WIESER et al, 2013), rabbits (WIESER et al, 2013), dogs (BARRETT et al, 1991WIESER et al, 2013;KOBASHIGAWA et al, 2015), chinchillas (LIMA et al, 2010;MULLER et al, 2010), alpacas (WELIHOZKIY et al, 2011;RANKIN et al, 2012), goat, guinea pigs, cows and sheep (WIESER et al, 2013), birds (LACERDA et al, 2014), turtles (SOMMA et al, 2015) and horses (BROOKS et al, 2001;KAPS et al, 2003;WIESER et al, 2013). Previous investigations have shown no significant differences between an individual's two eyes with respect to CTT evaluations (GOLEBIOWSKY et al, 2011;WIESER et al, 2013).…”

“…In horses, the sensitivity values are higher compared to other animals such as dogs and cattle (KAPS et al, 2003;WIESER et al, 2013). It can be affected by several factors, including the skull anatomy and orbit that change the positioning and insertion of the eyeball in each breed, ambient temperature and humidity and age of the individual (LACERDA et al, 2014;MONÇÃO-SILVA et al, 2016).…”

“…Factors that may influence the corneal touch threshold (CTT) values have already been studied in horses (BROOKS et al, 2000;KAPS et al, 2003;WIESER et al, 2013), birds (LACERDA et al, 2014), dogs (KOBASHIGAWA et al, 2015) and cats (BLOCKER & VAN DER WOERT, 2001). However, studies that addressed the mechanism and values of corneal sensitivity in horses are scarce, and when carried out, data were reported without breed subdivision (BROOKS et al, 2001;KAPS et al, 2003;WIESER et al, 2013).…”

“…The Cochet-Bonnet esthesiometer is used to determine the corneal touch threshold (CTT), at which a blink reflex, retraction of the eyeball or incursion of the third eyelid is induced in response to a stimulus (MULLER et al, 2003;KAPS et al, 2003;WIESER et al, 2013).…”