DISPOSABLE CONTACT LENSES
Disposable contact lenses are soft lenses which are designed to be replaced on a regular basis - daily, fortnightly
or monthly. This means that many of the problems that wearers experienced when contact lenses were replaced annually
or less often are rarely seen now. The more often a lens is replaced, the less dirty and deposited it becomes In
addition, twentyfirst century materials minimise problems related to oxygen deprivation due to their superior oxygen
transmissibility. Daily disposable contact lenses are the ultimate in disposable lenses since they are thrown away
after only one day's wear, so they don't need to be cleaned and offer exceptional convenience and good value for
RIGID GAS PERMEABLE CONTACT LENSES
Rigid gas permeable contact lenses are non-disposable lenses made of rigid materials. They're custom made and they're
particularly useful for high prescriptions, unusual eye conditions, irregular eye shapes, people who have had corneal
grafts and people with keratoconus. They provide excellent clarity of vision, although they require a longer period
of adaptation than soft lenses. Gas permeable contact lenses offer excellent long-term corneal health since
they allow almost as much oxygen reach the eye surface as not wearing a lens. Nearly all rigid lenses are made
from gas permeable materials and should be replaced every year or two. Wearers of all kinds of contact lenses
should have eye exams annually.
LEAVE-IN EXTENDED WEAR CONTACT LENSES
Leave-in (extended wear) contact lenses are designed to be worn continuously, (usually for up to thirty days and nights)
and then replaced. They are a very convenient option since they don't need to be put in or taken out daily, and
generally don't need cleaning. They offer good vision without glasses around the clock and almost eliminate the
need for contact lens solution. They are available in a wide range of prescriptions, including multifocals.
It's important to be aware that wearing lenses overnight comes with a higher risk of serious eye infection than wearing
your lenses only during the day does, so you need to discuss the pros and cons fully with your contact lens practitioner.
If you're wearing this kind of lens it's particularly important to have regular checkups and to take immediate
action if you have a red or sore eye.