Which tests are used to evaluate suspected Acanthamoeba keratitis?

Which tests are used to evaluate suspected Acanthamoeba keratitis?

• A. NaFl, Rose Bengal (r/o HSV), Anterior segment photography, Culture
• B. Visual field testing, OCT
• C. Tonometry only
• D. MRI with contrast

Answer: (A)

Suspected Acanthamoeba keratitis is evaluated by combining surface assessment with laboratory confirmation. Fluorescein staining reveals epithelial defects commonly seen in keratitis, while Rose Bengal helps identify devitalized surface cells and irregular staining that can support distinguishing AK from other keratitides, such as HSV. Documenting the findings with anterior segment photography provides a record of appearance and progression, which is helpful given AK’s often prolonged and variable course. The key confirmatory test is culture of corneal scrapings to grow Acanthamoeba (often on non-nutrient agar with bacteria or via molecular methods), which establishes the diagnosis. Tests like visual field testing, OCT, tonometry, or MRI aren’t used to diagnose AK; they serve other ocular or systemic purposes and don’t provide a direct diagnosis for suspected Acanthamoeba keratitis.

Suspected Acanthamoeba keratitis is evaluated by combining surface assessment with laboratory confirmation. Fluorescein staining reveals epithelial defects commonly seen in keratitis, while Rose Bengal helps identify devitalized surface cells and irregular staining that can support distinguishing AK from other keratitides, such as HSV. Documenting the findings with anterior segment photography provides a record of appearance and progression, which is helpful given AK’s often prolonged and variable course. The key confirmatory test is culture of corneal scrapings to grow Acanthamoeba (often on non-nutrient agar with bacteria or via molecular methods), which establishes the diagnosis.

Tests like visual field testing, OCT, tonometry, or MRI aren’t used to diagnose AK; they serve other ocular or systemic purposes and don’t provide a direct diagnosis for suspected Acanthamoeba keratitis.