Development and Validation of a Standardized Palpebral Conjunctival Redness Scale

Area of Science:

• Ophthalmology
• Immunology
• Medical Imaging

Background:

• Ocular inflammation assessment traditionally relies on bulbar conjunctival redness (BCR) scales.
• The palpebral conjunctiva has distinct vascular and immune properties requiring a specialized assessment tool.
• Existing scales may not accurately capture inflammation localized to the palpebral conjunctiva.

Purpose of the Study:

• To develop and validate a standardized palpebral conjunctival redness (PCR) scale.
• To address the unique anatomical and immunological characteristics of the palpebral conjunctiva.
• To enhance clinical assessment of ocular inflammation in specific regions.

Main Methods:

• A 10-point PCR grading scale was created using digital image manipulation (Adobe Photoshop).
• The scale was validated by trained ophthalmic professionals assessing 24 eyes.
• Statistical analyses included Cronbach's alpha, ICC, paired t-tests, and Pearson's correlation.

Main Results:

• The PCR scale demonstrated excellent inter-rater reliability (ICC=0.773) and strong internal consistency (Cronbach's alpha=0.880).
• Mean PCR scores were significantly higher than BCR scores (p<0.0001).
• A moderate correlation (r=0.45) was observed between PCR and BCR scales.

Conclusions:

• A reliable and clinically applicable PCR grading scale was successfully established.
• The PCR scale complements BCR assessments, highlighting the need for region-specific tools.
• This scale enhances diagnostic sensitivity for palpebral conjunctival conditions.