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What is Soft Lenses ?
   

Hard" lenses were the original contact lenses made several decades ago from a plastic called PMMA. For a long time they were the only kind of lens but they are seldom used anymore as they have several drawbacks and have been superseded by "Rigid" lenses. In fact, when people say hard lenses they are most likely referring to the gas permeable type. Gas permeable lenses are similar to hard lenses in design and appearance, however as the name suggests the material they are made of is permeable to gases (most importantly Oxygen and Carbon Dioxide) whereas PMMA is completely impermeable to gases. "Soft" contact lenses are completely different in that they are slightly larger, flexible and made of materials which soak up water. In fact the uptake of water is what allows soft lenses to transmit Oxygen to the cornea, the plastic itself being impermeable. The water also gives them their flexibility.
if you let a soft lens dry out, it does become quite brittle.

Caring for Soft Contact Lenses
The Basics of Soft Contact Lens Care: Clean, Rinse and Disinfect
  • Wash your hands so that you don't transfer dirt and germs to your eye. Try to avoid moisturizing soaps, as they are not good for contact lenses. Dry your hands with a lint-free towel.
  • Remove one lens and clean it with the recommended solution. Cleaning removes eye-produced buildup, cosmetics and other debris that impairs lens comfort. Some products require you to rub the lens in the palm of your hand with a few drops of solution, while others just require rinsing.
  • Rinse the lens again to remove the loosened debris, making sure to take as long as the package directs: rinsing is an important step.
  • Place the lens in your clean lens case or lens holder and fill with the appropriate solution for your soaking and disinfecting system. Disinfecting kills microorganisms on the lens. Disinfection time varies from product to product; check the package for details.
  • Repeat steps two through four for your other lens.

Beyond Clean, Rinse and Disinfect

  • Protein.
    Depending on what kind of contact lenses you wear and how much protein your eyes deposit on your contacts, your doctor may recommend you use a product for protein removal. While cleaning them does remove some protein, it can still build up on your lenses and make them uncomfortable. That's why the longer you wear lenses before replacing them, the more likely you are to need a protein remover. For example, if you wear disposables, you probably won't need one, but if you replace your lenses about once a year, you definitely will. Products for removing protein include enzymatic cleaner and daily protein removal liquids.
  • Eye Dryness and Irritation.
    Use contact lens eyedrops to lubricate your eyes and rewet your lenses.
  • Eye Sensitivity and Allergies.
    A small percentage of patients develop an allergy to the chemicals present in contact lens solutions. If this is the case with you, you don't need an additional product: you just need to switch products to those marked "preservative-free."

Contact Lens Care Must-Knows

Once you've decided which product you'd like to try, discuss your plans with your eye doctor. Don't switch brands until you determine that the new brand is compatible with your other products and with your contact lenses.

Regardless of which care regimen or brands you use, remember:

  • Never touch solution bottle tips to any surface, including your body: the solution can become contaminated.
  • Avoid getting tap water on your contact lenses and accessories, as it can carry a microorganism called Acanthamoeba that causes serious eye infections. While regular contact lens disinfection procedures do kill Acanthamoeba, they typically don't kill its cysts.
  • Remember to clean your contact lens accessories (lens case, cleaning/disinfecting devices, enzymatic cleaner vials and so on) as directed.
  • Lens cases can be rinsed with hot tap water and dried when not in use.
  • Throw out your contact lens case once a month, or as directed, to reduce your risk of infection.

Most importantly, clean and disinfect your contact lenses once a day (those with extended wear contacts should clean and disinfect them when they take them out, unless the lenses are scheduled to be discarded). Not only will your eyes be safer and healthier, but your contact lenses be more comfortable to wear, too.