Tap Water and Risk of Acanthamoeba Keratitis in Rigid Gas-Permeable Lens Wearers: Sacred Cow or Culprit?

1. Rigid gas-permeable lens materials differ fundamentally from soft lenses in that they do not contain water; are hydrophobic; are rigid and mechanically resistant; and last much longer. 2. Tap water can be used in different ways (rinsing after daily cleaner with subsequent disinfection; rinsing just before putting the lens on the eye; storage in water, etc.), and all these applications of water may have different sequelae. 3. The quality of tap water between various cities, regions, and countries can also vary substantially.

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