Water is the biggest risk
Tap water carries Acanthamoeba and Pseudomonas. Rinsing a lens or a case under the tap, or swimming or showering in lenses, is how those organisms reach the cornea. Never use water for anything that touches the lens.
Sleeping in lenses
Closed eyes have far less oxygen and tear flow. Overnight wear is the strongest single risk factor for corneal infection, even with lenses approved for extended wear. Coloured lenses are almost never approved for sleep.
Topping up solution
Old solution in the case loses its disinfecting power and becomes a culture medium. Empty, rinse with fresh solution, and let the case air-dry face down.
Keeping the case too long
Replace the case every one to three months. A worn case with a scratched surface cannot be cleaned properly.
Wearing past the replacement date
A monthly lens worn for eight weeks has a degraded surface and a biofilm. The date is a maximum, not a target.
Hands and towels
Wash with soap and dry with a lint-free towel. Wet hands transfer water, and paper towels leave fibres on the lens.
Makeup order
Lenses in first, makeup second; remove makeup before removing lenses. Mascara flakes under a lens scratch the cornea.
Sharing lenses
Never. Even within a family. The fit and the hygiene history are personal.
Ignoring early symptoms
Redness, watering or a gritty feeling that lasts more than an hour after removal is a reason to stop and get checked, not to switch brands.
Buying unclear devices
A lens that is not cleared for your market has no assurance about materials or sterility. Check the clearance before the colour.
Frequently Asked Questions
Does solution expire?
Yes. Discard opened multipurpose solution after the period stated on the bottle, usually 60 to 90 days.
Can I use saline instead of solution?
No. Saline rinses but does not disinfect.
Is it safe to wear lenses in the shower?
No. Water exposure is the main route for the organisms that cause serious corneal infections.
