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Animal / preclinicalBMC veterinary research · 2026

Sensitivity of the iFalcon TM V700 rebound tonometer to measurement distance, angle and position in ex-vivo rabbit eyes.

Jing Jin, Hao Cheng, Yunhao Su, Ji Fu

OphthalmologyAnimal / preclinical

Tonometer readings changed by less than 2 mmHg despite technique variations.

Sensitivity of the iFalcon TM V700 rebound tonometer to measurement distance, angle and position in ex-vivo rabbit eyes.

Jing Jin … Ji Fu

BMC veterinary research · 2026

Background

Rebound tonometers are widely used for intraocular pressure (IOP) monitoring in animal experiments.

Purpose

To evaluate the measurement stability of the iFalcon TM V700 rebound tonometer under different measuring conditions, this study employed a stepwise pressure-increasing protocol to set eight target IOP levels (10-50 mmHg) in two enucleated rabbit eyes (n = 2).

Results

device readings barely shifted from operator handling differences - a good sign

Distance

-1.8125mmHg

Angle

-0.945mmHg

Position

-1.8175mmHg

More results

We systematically investigated the effects of measuring distance (4-7 mm), measuring angle (approximately 30° superior, inferior, left, and right relative to the corneal normal), and corneal measuring location (central cornea and 3 mm peripheral cornea) on IOP readings.

More results

Paired t-tests were used to compare measurements between each test condition and its corresponding reference condition.

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Conclusion

Although the iFalcon TM V700 exhibited statistically significant dependent biases under the aforementioned operating conditions, the absolute magnitudes were limited and had little impact on experimental interpretation and conclusions, suggesting that the device demonstrates reasonable measurement stability under the tested conditions.

Post

Sensitivity of the iFalcon TM V700 rebound tonometer to measurement distance, angle and position in ex-vivo rabbit eyes.

Tonometer readings changed by less than 2 mmHg despite technique variations.

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