Investigative modalities in infectious keratitis

Area of Science:

• Ophthalmology
• Microbiology
• Medical Diagnostics

Background:

• Infectious keratitis requires timely and accurate diagnosis for effective management.
• Standard diagnostic guidelines exist, but a review of investigative modalities is beneficial.

Purpose of the Study:

• To review and describe investigative modalities for diagnosing microbial keratitis.
• To outline preferred practice patterns and highlight the importance of pre-treatment cultures.

Main Methods:

• Extensive Medline literature search.
• Review and brief description of diagnostic investigative modalities.
• Emphasis on microscopic examination of smears (KOH wet mount, Gram's, Giemsa stains) and corneal cultures.
• Discussion of in vivo confocal microscopy and molecular diagnostic techniques (PCR, PFGE).

Main Results:

• Microscopic examination of smears is crucial for rapid diagnosis of bacterial, fungal, and amoebic keratitis.
• Corneal cultures are essential for all suspected infectious keratitis cases.
• In vivo confocal microscopy offers early and non-invasive detection of Acanthamoeba and fungi.
• Molecular techniques provide advanced diagnostic capabilities.

Conclusions:

• A combination of traditional and advanced diagnostic methods ensures accurate and timely diagnosis of infectious keratitis.
• Routine pre-treatment cultures and prompt microscopic examination are vital for initiating empirical therapy.
• In vivo confocal microscopy and molecular diagnostics represent significant advancements in detecting challenging cases.