title: [Clinical comparison of the Tono-Pen tonometer to the Goldmann applanation tonometer].
abstract: OBJECTIVE
  To compare the Tono-Pen tonometer with the Goldmann applanation and assess the precision and accuracy of the Tono-Pen tonometer.
  
  
  METHODS
  62 cases (111 eyes) were random measured with the Tono-Pen tonometer and the Goldmann applanation tonometer.
  
  
  RESULTS
  Overall we found that 74.8% of the Tono-Pen readings were within +/- 2 mmHg of the Goldmann applanation readings and 83.8% were within +/- 3 mmHg. The correlation coefficient between the readings of the two instruments was 0.865. The mean value of the paired differences was (-0.51 +/- 2.24)mmHg in the 9 to 30 mmHg interval.
  
  
  CONCLUSIONS
  The Tono-Pen tonometer measures intraocular pressure in a manner that corresponds well to the Goldmann applanation tonometer, especially in the 9 - 30 mmHg interval. But this tonometer may overestimate the intraocular pressure in eyes with low intraocular pressure, and underestimate the intraocular pressure in eyes with high intraocular pressure.
authors.affiliation: Dept. of Ophthalmology, the Second Xiangya Hospital of Central South University, Changsha 410011, China.
authors.forename: Bing
authors.initials: B
authors.lastname: Jiang
authors.forename: Youqin
authors.initials: Y
authors.lastname: Jiang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005260:Female; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000592:standards