Classifying the severity of corneal ulcers by using the "1, 2, 3" rule

Area of Science:

• Ophthalmology
• Infectious Diseases
• Corneal Diseases

Background:

• Bacterial keratitis is a serious eye infection that can lead to vision loss.
• Accurate assessment of bacterial keratitis severity is crucial for predicting patient outcomes.
• Existing methods for categorizing severity may not be sufficiently predictive of visual impairment.

Purpose of the Study:

• To introduce and define the "1, 2, 3" rule for classifying bacterial keratitis severity.
• To evaluate the "1, 2, 3" rule's ability to predict visual loss after bacterial corneal infection.
• To establish the clinical utility of the "1, 2, 3" rule in managing bacterial keratitis.

Main Methods:

• A cohort of 70 patients with infectious corneal ulcers was evaluated by cornea subspecialists.
• Inclusion criteria were applied, resulting in 41 patients for analysis.
• Data collected included visual acuity, ulcer characteristics, culture results, and treatment details.

Main Results:

• The "1, 2, 3" rule demonstrated 100% sensitivity in detecting potentially sight-threatening (PST) ulcers.
• The rule had 57.14% specificity in identifying rarely sight-threatening (RST) ulcers.
• The negative predictive value was 100%, while the positive predictive value was 28.57%.

Conclusions:

• Potentially sight-threatening (PST) corneal ulcers carry a significantly higher risk of best spectacle-corrected visual acuity (BSCVA) loss.
• Rarely sight-threatening (RST) corneal ulcers are associated with a lower risk of vision loss.
• The "1, 2, 3" rule is a clinically useful tool for predicting visual outcomes in bacterial keratitis.