title: Measurements of intraocular pressure by Goldmann tonometry, Tonopen XL, and the transpalpebral tonometer, TGDc-01, after penetrating keratoplasty: a comparativye study.
abstract: OBJECTIVE
  The aim of this study was to compare intraocular pressure (IOP) measurements obtained by Goldmann tonometry (GT), the Tonopen XL, and a new transpalpebral tonometer, TGDc-01, in eyes that had undergone penetrating keratoplasty (PKP).
  
  
  METHODS
  IOP was measured in post-PKP eyes by means of GT, Tonopen XL, and TGDc-01. Central corneal thickness measurements were also obtained for all eyes.
  
  
  RESULTS
  Forty-five eyes of 43 patients were enrolled in the study. The mean IOP difference (+/-SD) was -0.42 +/- 5.83 mm Hg between GT and Tonopen and 3.20 +/- 7.55 mm Hg between GT and TGDc-01. The correlation coefficient was 0.84 between GT and Tonopen XL (P < 0.001) and 0.71 between GT and TGDc-01 (P < 0.001). Overall 2-way analysis of variance between the means showed no significant differences between the 3 devices (P = 0.077).
  
  
  CONCLUSIONS
  A closer agreement was found between GT and Tonopen XL in post-PKP eyes. TGDc-01 yielded lower IOP readings than the other 2 devices. It remains uncertain whether this new transpalpebral tonometer is simply inaccurate or whether avoiding contact with the corneal graft by measuring IOP through the eyelid enables it to provide more accurate IOP readings than those obtained by transcorneal techniques.
authors: Department of Ophthalmology, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 64239, Israel.
authors: Gabi
authors: G
authors: Shemesh
authors: Michael
authors: M
authors: Waisbourd
authors: David
authors: D
authors: Varssano
authors: Adi
authors: A
authors: Michaeli
authors: Moshe
authors: M
authors: Lazar
authors: Shimon
authors: S
authors: Kurtz
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D015948:Keratoplasty, Penetrating; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014065:Tonometry, Ocular / Q000295:instrumentation*; D055815:Young Adult