Hydrogen peroxide (H₂O₂)

Hydrogen peroxide is a colourless liquid with the chemical formula H₂O₂. In contact lens care, it is used at a concentration of approximately 3 per cent. The principle behind its action is that hydrogen peroxide dissolves organic material such as proteins, fats and other deposits, whilst simultaneously removing micro-organisms from the lens surface.

Peroxide solutions are designed for soft contact lenses. They are often chosen by people who are sensitive to preservatives, as peroxide systems do not contain any preservatives. After the cleaning process, the hydrogen peroxide is completely neutralised into water (H₂O) and oxygen (O₂), so the lenses are safe to wear.

Neutralisation takes place in two ways: using a catalyst (usually a platinum disc in the lens case) or using a neutralising tablet. Both methods ensure that the peroxide is completely converted within a few hours. You must never put lenses that have not yet been neutralised into your eyes, as unneutralised hydrogen peroxide stings and can irritate the surface of the eye.

Hydrogen peroxide is used in lens solutions specifically designed for cleaning and disinfecting soft contact lenses. At SMEYEL , you’ll find peroxide solutions that work on this principle.

When should you choose a peroxide system?

• If you are sensitive to preservatives in all-in-one solutions.
• If you suffer from protein deposits on your lenses.
• If you’re looking for a thorough cleaning solution suitable for daily use.

How do you use hydrogen peroxide solution?

Always follow the manufacturer’s instructions for use. Generally, you place the lenses in the special lens case, fill the case with peroxide solution and leave the system to neutralise for at least six hours. Do not rinse the lenses afterwards, as the solution will already have been converted into water and oxygen. Never use a standard lens case, as only the case supplied with the product contains the catalyst or neutralisation system.

What should you look out for?

Never insert lenses that are still in peroxide solution into your eyes. Check that the neutralisation process is complete before inserting the lenses. Always keep the solution out of the reach of children and do not mix the bottle with other eye drops or liquids.