Validation and Comparative Analysis of a Contemporary Non-Contact Corneal Aesthesiometer

Area of Science:

• Ophthalmology
• Ocular Surface Disease
• Neuroscience

Background:

• Corneal sensitivity is crucial for maintaining ocular surface health.
• Assessing corneal sensitivity aids in diagnosing and monitoring various eye conditions.
• Existing methods for measuring corneal sensitivity require validation with newer technologies.

Purpose of the Study:

• To evaluate the agreement between a new enhanced dual-temperature non-contact corneal aesthesiometer (NCCA) and a standard NCCA.
• To determine the reliability of the enhanced NCCA in measuring corneal sensitivity thresholds.
• To assess the clinical utility of the enhanced NCCA for ocular surface health evaluations.

Main Methods:

• Prospective, cross-sectional study involving 51 healthy participants.
• Central corneal sensitivity thresholds measured using both enhanced and standard NCCA devices.
• Inter-device agreement assessed via Bland-Altman analysis and intraclass correlation coefficients.

Main Results:

• No significant difference in median corneal sensitivity thresholds between the enhanced and standard NCCA (p = 0.73).
• Moderate inter-device agreement observed (mean difference: -0.01 mbar, 95% LoA: -0.41 to 0.39 mbar).
• Increased measurement variability noted at higher corneal sensitivity thresholds.

Conclusions:

• The enhanced NCCA provides reliable corneal sensitivity measurements.
• Acceptable agreement exists between the enhanced and standard NCCA models.
• The enhanced NCCA is a viable tool for assessing corneal sensitivity and ocular surface health.