Comparison of Tono‐Pen Avia with Goldmann applanation tonometer

Purpose 1. To compare the IOP readings taken by Tono‐Pen Avia (Reichert) With the GAT. 2. To assess the influence of central corneal thickness (CCT) on these measurements Methods Prospective, controlled study including one eye at random of 30 glaucomatous patients and 30 healthy subjects. Patients with previous refractive surgery or corneal pathology were excluded. GAT measurement was followed by Tono‐Pen Avia after a 10 min break. Only Reading with 95% statistical confidence index were taken into account. Pachymetry measurements were done at the end of the examination. Pearson correlation coefficient to assess the correlation between GAT and Avia tonometer. The agreement between IOP readings from GAT and Avia was assessed using the Bland‐Altman plots Results Mean IOP in glaucoma was 18.3 ± 6.7 mmHg with GAT and 16.7 ± 4.7 with Avia. Mean IOP in control group was 16.4 ± 3.8 mmHg with GAT and 15.2 ± 4.2 mmHg with Avia. Mean CCT was 545 ±101.2 µ in glaucoma and 546.7 ± 99.4 µ in control group. There was no correlation between CCT and the IOP readings with GAT or Avia in both groups(p<0.05) Conclusion Tono‐Pen Avia is a very easy‐to‐use handheld applanation tonometer that functions in any position especially for in‐bed or wheelchair patients. It can be used for screening purposes providing a lower IOP value than GAT and indicating a need for further investigation in suspect cases