Aqueous flare measurement with laser flare-cell meter.

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Biophysics

Background:

• Anterior chamber protein concentration is a key indicator of ocular health.
• Accurate in vivo measurement of aqueous humor proteins is clinically significant.
• Existing methods for assessing protein levels can be invasive or subjective.

Purpose of the Study:

• To evaluate a novel instrument, the laser flare-cell meter, for quantifying anterior chamber protein concentration in vivo.
• To establish the relationship between instrument readings (photon count) and protein concentration.
• To assess the influence of iris color on measurement accuracy.

Main Methods:

• A linear relationship was established between photon counts from the laser flare-cell meter and bovine serum albumin concentration.
• Measurements were performed on 29 normal human eyes, categorized by iris color (dark vs. blue/green).
• Photon counts and background scattering were analyzed in relation to iris pigmentation.

Main Results:

• A strong linear correlation was observed between photon count and protein concentration.
• No significant difference in photon counts was found between eyes with different iris colors.
• Estimated aqueous protein concentrations were 15.7 mg/100 ml (dark irises) and 18.6 mg/100 ml (blue/green irises).
• Background scattering showed minimal impact on photon count measurements.

Conclusions:

• The laser flare-cell meter provides a reliable method for measuring in vivo anterior chamber protein concentration.
• Iris pigmentation does not significantly affect the accuracy of the laser flare-cell meter.
• The instrument demonstrates good correlation with conventional microscopic flare evaluations and is suitable for clinical research.