Abstract
BackgroundThe Schirmer tear test (STT) is widely used in both human and veterinary ophthalmology. Two types of STTs have been developed: STT I and SST II. The STT I measures the basal and reflex tear production and is the most widely used STT. However, several factors influence the STT results such as the person performing the test and the location of the strip placement within the conjunctival sac. The aim of this study was to measure the basal and reflex tear production (STT I) in clinically normal horses with open versus closed eyes.ResultsForty clinically healthy horses without any ocular diseases were included. On day 1, the STT I was first performed on all the horses with the eyes open followed by an STT I with closed eyes performed 30 min later. On day 2, all horses had their eyes closed during the first STT and the eyes open during the second test performed 30 min later. The mean value of the STTs performed on open eye was significantly less than the STT performed on closed eye on both days of examination.ConclusionThis study showed a small but statistically significant difference between STT values obtained with open versus closed eyes in clinically normal horses.
Highlights
The Schirmer tear test (STT) is widely used in both human and veterinary ophthalmology
On day 1, the STT was first performed on all the horses with the eyes open followed by an STT with closed eyes 30 min later
On day 2, all horses had the eyes closed during the first STT and the eyes open during the second test performed 30 min later
Summary
The Schirmer tear test (STT) is widely used in both human and veterinary ophthalmology. The aim of the present study was to compare the STT values obtained with open versus closed eyes in clinically normal horses. On day 1, the STT was first performed on all the horses with the eyes open followed by an STT with closed eyes 30 min later.
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