October 1977
Volume 16, Issue 10
Articles  |   October 1977
Evaluation of applanation tonometers for the dog eye.
Investigative Ophthalmology & Visual Science October 1977, Vol.16, 963-968. doi:
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      K N Gelatt, R L Peiffer, G G Gum, R M Gwin, J L Erickson; Evaluation of applanation tonometers for the dog eye.. Invest. Ophthalmol. Vis. Sci. 1977;16(10):963-968.

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      © ARVO (1962-2015); The Authors (2016-present)

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The Mackay-Marg, pneumatonograph, TonAir, and EMT-20 tonometers were evaluated in the normal dog eye. Tonometric scale readings were compared to the manometric recordings from the anterior chamber. The Mackay-Marg tonometer evaluated in open and closed systems was the most reliable (goodness of fit [r2] = 0.96) with intraocular pressure up to 100 mm. Hg. The pneumatonograph also exhibited high reliability (r2 = 0.92) but tended to underestimate intraocular pressures above 40 to 50 mm. Hg. The TonAir and EMT-20 tonometers were the least satisfactory for the dog, with r2 of 0.77 and 0.66 to 0.81, respectively. The Mackay-Marg is the most satisfactory tonometer for the dog.


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