Overview
Infectious epithelial keratitis involves inflammation of the corneal epithelium due to microbial invasion, leading to visual impairment and potential blindness if untreated. Diagnosis and management require prompt identification of the causative agent and targeted therapy to prevent complications 12.Diagnosis
Clinical Presentation: Corneal ulceration, redness, pain, photophobia, and decreased visual acuity 12.
Slit-Lamp Examination: Essential for initial assessment, though accuracy can be improved with advanced imaging techniques 2.
In Vivo Confocal Microscopy (IVCM): Provides real-time, high-resolution images of corneal structures, aiding in direct visualization of pathogens like fungi and Acanthamoeba 1.
Deep Learning Algorithms: Utilize slit-lamp images to predict causative pathogens with high accuracy (e.g., Acanthamoeba: 97.9% accuracy) 2.
Microbiological Cultures: Necessary for definitive pathogen identification, despite limitations in speed and sensitivity 12.Management
Antibiotics: First-line for bacterial keratitis; specific agents include fluoroquinolones (e.g., moxifloxacin) and aminoglycosides (e.g., gentamicin) 4.
Antifungals: For fungal keratitis, agents like natamycin are commonly prescribed 4.
Antiparasitics: Acanthamoeba keratitis treated with polyhexamethylene biguanide (PHMB) and chlorhexidine 1.
Corticosteroids: Used cautiously in conjunction with antibiotics to reduce inflammation, particularly in viral keratitis (e.g., HSV) 4.
Contact Lens Hygiene: Silver-impregnated cases show promise in reducing microbial contamination, though efficacy varies by brand 3.
Follow-Up: Regular monitoring with IVCM can assess treatment efficacy without additional trauma to the cornea 1.Special Populations
Pediatrics: Specific antibiotic dosing and monitoring may be required due to differences in corneal healing and immune response 4.
Elderly: Increased risk of complications; careful management and frequent follow-ups are essential 4.
Comorbidities: Patients with diabetes or immunodeficiency may require extended treatment durations and closer surveillance 4.Key Recommendations
Utilize in vivo confocal microscopy for real-time assessment of infectious keratitis, enhancing diagnostic accuracy and avoiding invasive sampling techniques (Evidence: Moderate 1).
Employ deep learning algorithms for slit-lamp images to predict causative pathogens, especially in challenging cases, given their high diagnostic accuracy (Evidence: Strong 2).
Consider silver-impregnated contact lens storage cases to reduce microbial contamination, though efficacy varies among brands (Evidence: Moderate 3).
Tailor antibiotic therapy based on clinical suspicion and microbiological culture results, with corticosteroids used cautiously in viral keratitis (Evidence: Moderate 4).
Increase vigilance in managing infectious keratitis in pediatric and elderly patients, accounting for unique healing rates and complication risks (Evidence: Expert opinion 4).References
1 Ledbetter EC. Applications of in vivo confocal microscopy in the management of infectious keratitis in veterinary ophthalmology. Veterinary ophthalmology 2022. link
2 Koyama A, Miyazaki D, Nakagawa Y, Ayatsuka Y, Miyake H, Ehara F et al.. Determination of probability of causative pathogen in infectious keratitis using deep learning algorithm of slit-lamp images. Scientific reports 2021. link
3 Dantam J, Zhu H, Stapleton F. Biocidal efficacy of silver-impregnated contact lens storage cases in vitro. Investigative ophthalmology & visual science 2011. link
4 McAllum PJ, McGhee CN. Prescribing trends in infectious keratitis: a survey of New Zealand ophthalmologists. Clinical & experimental ophthalmology 2003. link