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The Effect of Perkins, Tono-Pen, and Schiötz Tonometry on Intraocular Pressure

1991; Elsevier BV; Volume: 111; Issue: 1 Linguagem: Inglês

10.1016/s0002-9394(14)76898-9

1879-1891

Marc M. Whitacre, Mark Emig,

Ophthalmology and Visual Impairment Studies

We studied the intraocular pressure changes produced in five eye bank eyes by Perkins, Tono-Pen, and Schiötz tonometry performed by experienced and inexperienced personnel. When all users were considered together, Perkins tonometry produced a mean intraocular pressure increase of 0.7 mm Hg, significantly less than the mean increase of 12.1 mm Hg produced by Tono-Pen tonometry (P < .05) or the mean increase of 16.5 mm Hg produced by Schiötz tonometry (P < .01). There was no statistically significant difference between the intraocular pressure increase produced by Tono-Pen or Schiötz tonometry. Tonometry performed by inexperienced Tono-Pen users and experienced or inexperienced Schiötz users produced a significantly greater increase in intraocular pressure than that performed by experienced Tono-Pen users (P < .05), and an extremely significant increase compared to tonometry performed by experienced or inexperienced Perkins users (P < .01). The marked increase in intraocular pressure produced by Tono-Pen tonometry suggests that hand-held electronic applanation tonometers should be used with caution in eyes with a weakened cornea or sclera. We studied the intraocular pressure changes produced in five eye bank eyes by Perkins, Tono-Pen, and Schiötz tonometry performed by experienced and inexperienced personnel. When all users were considered together, Perkins tonometry produced a mean intraocular pressure increase of 0.7 mm Hg, significantly less than the mean increase of 12.1 mm Hg produced by Tono-Pen tonometry (P < .05) or the mean increase of 16.5 mm Hg produced by Schiötz tonometry (P < .01). There was no statistically significant difference between the intraocular pressure increase produced by Tono-Pen or Schiötz tonometry. Tonometry performed by inexperienced Tono-Pen users and experienced or inexperienced Schiötz users produced a significantly greater increase in intraocular pressure than that performed by experienced Tono-Pen users (P < .05), and an extremely significant increase compared to tonometry performed by experienced or inexperienced Perkins users (P < .01). The marked increase in intraocular pressure produced by Tono-Pen tonometry suggests that hand-held electronic applanation tonometers should be used with caution in eyes with a weakened cornea or sclera.