Applanation vs Non-Contact Tonometry Comparison

Compares IOP measurements from Goldmann applanation tonometry (GAT, gold standard) versus non-contact tonometry (NCT/air puff). NCT readings are typically 1–3 mmHg higher than GAT. Adjusts NCT readings based on published correlation data to estimate GAT-equivalent IOP.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Compares IOP measurements from Goldmann applanation tonometry (GAT, gold standard) versus non-contact tonometry (NCT/air puff). NCT readings are typically 1–3 mmHg higher than GAT. Adjusts NCT readings based on published correlation data to estimate GAT-equivalent IOP

Each component has a specific meaning:

  • Goldmann applanation tonometry (GAT — The goldmann applanation tonometry (gat recorded for the scenario being assessed.
  • Gold standard) versus non-contact tonometry — The gold standard) versus non-contact tonometry recorded for the scenario being assessed.

Note: Interpret the tonometry comparison result against the thresholds and context described above.

How to Use

Enter the Goldmann applanation tonometry (GAT, gold standard) versus non-contact tonometry for the scenario you are assessing. Compares IOP measurements from Goldmann applanation tonometry (GAT, gold standard) versus non-contact tonometry (NCT/air puff). NCT readings are typically 1–3 mmHg higher than GAT. Adjusts NCT readings based on published correlation data to estimate GAT-equivalent IOP. Use the tonometry comparison result to inform your calculation.

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Frequently Asked Questions