Evaluation of healthy equine eyes by use of retinoscopy, keratometry, and ultrasonographic biometry

Abstract

Results of keratometry and ultrasonographic biometry varied widely. Additional research is needed to validate the keratograph used in our study for measurements in equine eyes.

Central corneal thickness measurements and ultrasonographic study of the growing equine eye

“…In this study, the ocular biometry of 50 young horses was performed with B‐mode ultrasound at a frequency of 10 MHz using a transcorneal approach. The obtained values tended to be smaller than those in studies involving adult horses . Similar values to our study were reported for young horses .…”

“…Different values have previously been reported for equine globe dimensions. The results vary between 3.0 and 6.8 mm for ACD, between 8.87 and 12.3 mm for CLT, between 17.37 and 24.48 mm for CLT, and between 32.9 and 43.1 mm for AGL (Table ) …”

Ultrasonographic biometry of the eyes of healthy adult donkeys

“…In absolute terms, the mean was even higher than that reported for horses by other authors (Rogers and others 1986, Mettenleiter 1995, Barsotti and others 2010, Grinninger and others 2010). Although we consider this assessment reliable, we believe it would be appropriate to perform further examinations in larger donkeys to confirm and explain this result and, possibly, to compare measurements with extirpated donkeys' eyes.…”

A retinoscopic survey of 333 horses and ponies in the UK

“…Grinninger et al . also found a tendency to myopia with age in their retinoscopic evaluation of healthy equine eyes, with age‐related changes occurring from the age of 7.5 years …”