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PubMed This is a summary of 61 peer-reviewed journal articles Updated
Ophthalmology · Acanthamoeba Keratitis

Acanthamoeba Keratitis Patient Guide

At a Glance

Acanthamoeba keratitis (AK) is a severe, sight-threatening cornea infection that primarily affects contact lens wearers. It requires urgent diagnosis using specialized tests like IVCM and an intensive, round-the-clock eye drop treatment plan managed by a cornea specialist.

A diagnosis of Acanthamoeba keratitis (AK) is frightening. It is a rare, severe, and sight-threatening infection of the cornea (the clear front window of the eye) caused by a microscopic amoeba. Because it is so rare—affecting roughly 1 in 21,000 soft contact lens wearers—many local doctors may not have experience treating it [1].

The pain is often intense and out of proportion to what the eye looks like, and the treatment requires a grueling, round-the-clock commitment [2][3].

This resource guide is designed to empower you with evidence-based information so you can understand your diagnosis, ask the right questions, and partner with the right specialist to protect your vision.

Navigating Your Journey

To help you understand what is happening and what comes next, we have broken down the information into specific sections:

01

Acanthamoeba Keratitis: You Are Not Alone

Learn why Acanthamoeba keratitis (AK) causes severe eye pain and what to expect after diagnosis. Discover treatment timelines, diagnostic tools, and next steps.

02

The Survival Tactics of Acanthamoeba

Learn why Acanthamoeba keratitis (AK) is so difficult to treat and diagnose. Understand its two-stage life cycle, why it mimics herpes, and steroid risks.

03

Solving the Mystery: How Doctors Test for AK

Learn how doctors diagnose Acanthamoeba keratitis (AK). Understand the pros and cons of IVCM, PCR testing, and corneal cultures to get an accurate diagnosis.

04

The Road to Recovery: Standard Treatment for AK

Learn the standard treatment for Acanthamoeba keratitis (AK). Understand the intensive eye drop schedule, debridement, miltefosine, and recovery timeline.

05

When Drops Aren't Enough: Surgery and Complications

Learn about Acanthamoeba keratitis surgery options, including corneal transplants (PKP) and laser procedures, plus the risks of severe complications.

06

Building Your Care Team & Daily Life with AK

Learn how to manage daily life with Acanthamoeba keratitis (AK). Understand the rigorous eye drop schedule, finding a cornea specialist, and easing eye pain.

Common questions in this guide

What is Acanthamoeba keratitis (AK)?
Acanthamoeba keratitis is a rare and severe infection of the clear front window of the eye, called the cornea. It is caused by a microscopic amoeba and can cause intense pain that feels out of proportion to how the eye actually looks.
How is Acanthamoeba keratitis diagnosed?
Doctors confirm the infection using advanced tools like In Vivo Confocal Microscopy (IVCM) and PCR testing. Because the amoeba has a complex life cycle, it is sometimes mistaken for a herpes eye infection in the early stages.
What is the treatment for Acanthamoeba keratitis?
Treatment involves a highly demanding, around-the-clock schedule of specific medicated eye drops to kill the amoeba. This rigorous process requires strict dedication and typically takes several months to complete.
What kind of doctor should I see for this infection?
You should seek care from a fellowship-trained cornea specialist with specific experience treating infectious keratitis. Because the condition is rare and challenging to treat, a specialist with access to advanced testing and targeted medications is essential.
Will I need surgery for Acanthamoeba keratitis?
If the infection does not respond to medicated eye drops, or if it causes significant scarring on your eye, surgery may be required. Your doctor might recommend a corneal transplant to remove the damage and help restore your vision.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.How many cases of Acanthamoeba keratitis have you treated in the past year?
  2. 2.Are you a fellowship-trained cornea specialist, and do you specialize in infectious keratitis?
  3. 3.Do you have direct access to In Vivo Confocal Microscopy (IVCM) or nested PCR testing for ongoing monitoring?
  4. 4.What is your protocol for managing pain that is not relieved by standard drops?

Questions For You

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References

References (3)
  1. 1

    The rising incidence of Acanthamoeba keratitis: A 7-year nationwide survey and clinical assessment of risk factors and functional outcomes.

    Randag AC, van Rooij J, van Goor AT, et al.

    PloS one 2019; (14(9)):e0222092 doi:10.1371/journal.pone.0222092.

    PMID: 31491000
  2. 2

    Acanthamoeba keratitis in Australia: demographics, associated factors, presentation and outcomes: a 15-year case review.

    Höllhumer R, Keay L, Watson SL

    Eye (London, England) 2020; (34(4)):725-732 doi:10.1038/s41433-019-0589-6.

    PMID: 31554948
  3. 3

    Acanthamoeba Keratitis: Perspectives for Patients.

    Bonini S, Di Zazzo A, Varacalli G, Coassin M

    Current eye research 2021; (46(6)):771-776 doi:10.1080/02713683.2020.1846753.

    PMID: 33151784

This guide is for educational purposes only and does not replace professional medical advice. Always consult a fellowship-trained cornea specialist immediately if you suspect a severe eye infection.

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