Merck Manual

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Intraocular Pressure (IOP) by Applanation Tonometry

Intraocular Pressure (IOP) by Applanation Tonometry

Species

Tonometer

IOP (mmHg) Mean ± SDa

Dog

MacKay-Marg

15.7 ± 4.2

Tono-Pen™

18.7 ± 5.5

12.9 ± 2.7

Tono-Vet®

10.8 ± 3.1

Cat

Tono-Pen

19.7 ± 5.6

Rabbit

Pneumatonograph

19.5 ± 1.8

17.9 ± 2.1

Horse

Tono-Pen

29.6 ± 6.2

23.3 ± 6.9

Cow

Tono-Pen

26.9 ± 6.7

Llama/alpaca

Tono-Pen

16.6 ± 3.6

Monkey (ketamine)

Tono-Pen

13.6 ± 3.7

Alligator

Tono-Pen

23.7 ± 2.1

Ferret

Tono-Pen

22.8 ± 5.5

Rat

Tono-Pen

17.3 ± 5.3

Hawk

Tono-Pen

20.6 ± 3.4

Owl

Tono-Pen

10.8 ± 3.6

a Duplicate figures represent different reports for that species.