Can be worn during sleep
MONTHLY: Where the eyes accept these high oxygen permeable lenses they can be used for 30 days and nights continuously.
WEEKLY: Another option in overnight wear lenses. More hygienic than monthly lenses due to the frequency of change.
FLEXIBLE: A schedule of lens wear that is mainly for day use with the flexibility of occasional overnight use for special occasions, weekends away. Probably more popular than Extended Wear.
LONG TERM WEAR
SOFT: This is the type of lens that originated in the 1970s and increased people’s confidence in the ability to wear lenses comfortably. Not used so regularly now due to the improved hygiene available with frequent replacement lenses.
RIGID/GAS PERMEABLE LENSES: These lenses give excellent vision. They need an adaption period which can be variable. They are best suited to full time wear.
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