Unlike
soft contct
lenses, Rigid Gas Permeable lenses (RGP)are really
rigid. These lenses require very careful handeling, they
are easy to scratch or break. Also RGP lenses has some
ajustement period, they don’t feel comfortable from
the first day you wear them.
At the same time, RGP has a number of advantages: they
are much less prune to protein buid ups and they seldom
cause allergic reactions. Though there are special solution
for clearing firm lenses, you can wash them with unparfurmed
soap.
Both soft contact lenses and rigid contact lenses are
used for correction of short-sightedness, far-sightedness,
astigmatism
and psybiopia, as well as color
contact lenses to change the color of your eyes. A
range of their application - from plus 20.0 up to a minus
of 20.0 dioptries.
Rigid lenses are simply irreplaceable if the patient
suffers from astigmatism or has a very irregular cornea.
Many doctors agree that for astigmatism RGP toric contact
lenses work better than soft
toric contacts.
Types of RGP lenses
There are actually two types of rigit lenses gas-permeable
and non gas-permeable (which are now pretty much a thing
of the past). The silicone containing in rigid lenses,
helps their good permeability for oxygen. And sufficient
ammount of ogygen is very important for healthy eyes.
But silicone suffers the same defect, as soft lenses:
protein build ups which causes discomfort and finally
limits service life of lenses.
As a general rule, rigid lenses let through much more
oxygen, especially when very high power is requared (in
this case soft contact lens would be very thick).
Both soft contacts and rigit lenses requare careful fitting
by and eye care professional. Soft lenses are usually
cheaper, but good ones last no longer than a month. Conventional
soft lenses that lasted for a year are not common any
more because they aren’t healthy for your eyes.
Rigit lenses, to the contrary, last much longer without
creating any health problems. So altimately they will
cost you less. You can also save a great deal if you order
them discount contact
lenses online.
