Stimulus characteristics of a novel air-based multiple stimulus aesthesiometer.

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Sensory Science

Background:

• Corneal sensitivity is crucial for ocular surface health.
• Accurate and repeatable measurement of corneal sensitivity is needed.
• Existing methods may lack precision or the ability to deliver multiple stimuli.

Purpose of the Study:

• To characterize the airflow stimulus of a novel air jet aesthesiometer.
• To confirm the consistency and repeatability of the instrument.
• To assess its suitability for measuring corneal sensitivity and facilitating summation studies.

Main Methods:

• A novel Dolphin Aesthesiometer utilizing a software-managed micro-blower was developed.
• Airflow characteristics including pattern, dispersion, force, and thermal effects were studied.
• Two nozzle types (1.6mm flexible, 0.5mm brass) were used for airflow control.

Main Results:

• The airflow was coherent and its spread rate constant, independent of stimulus strength.
• Airflow dispersion increased with airflow rate upon surface contact.
• The instrument applied a consistent, low force (10⁻⁴ N) and predominantly thermal stimulation.
• Repeatable thermal effects were observed, confirming instrument consistency.

Conclusions:

• The novel air jet aesthesiometer demonstrates high repeatability and consistency.
• The device is well-suited for measuring corneal sensitivity.
• Its capability for multiple stimuli delivery aids in corneal summation investigations.