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All horses were submitted to the rebound tonometry (Tonovet, Thiols, Finland) with and without upper lip twitch restraint.
Restraint of horses with upper lip twitch increases significantly equine intraocular pressure measured with rebound tonometry.
And understandably so; the scene took place on a warm spring day in New York's Central Park, with hundreds of onlookers and dozens of paparazzi scrutinizing every lip twitch.