Correlation of Perkins Hand-Held Applanation Tonometer with Non-Contact Tonometer
Keywords:Intraocular Pressure (IOP) ,Non-contact tonometer (NCT), Perkins applanation tonometer (PAT), Goldmann applanation tonometer (GAT), Right Eye (RE), Left Eye (LE).
Aim: To correlate the IOP by the use of Perkins hand-held applanation tonometer (PAT) with Non-contact
tonometer (NCT). Materials & Methods: Prospective cross-sectional study done on 148 eyes & 3 readings
were taken for each method & mean calculated. Statistical analysis: Unpaired-T test & Correlation-co
efficient, Sensitivity & Specificity were calculated for the NCT. Results: Mean age of subjects was 56.01±
9.73 yrs. Mean IOP with PAT & NCT 15.43 mmHg (95% CI 15.14–15.76) & 15.13 mmHg (95% CI 14.81–
15.46) respectively. NCT shows excellent agreement with PAT. Correlation coefficient(r) of IOP measured
by NCT & PAT is 0.97 & 0.91 for RE & LE respectively with p value <0.05, showed strong positive
correlation between the IOP measured by NCT & PAT. The NCT showed high sensitivity 86% & high
specificity 97.9 % respectively, coming across an excellent agreement with PAT. Interpretation: NCT is
easy to operate (non medical & Paramedical staff), minimum risk of infection & without any observer bias.
Only drawback is the cost. Conclusion: The current study shows that the NCT compares well with the PAT.
The NCT can be used as a reliable screening tool.
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