about RGP contact lenses
RGP contact lens stores
People who wore rigid lenses about ten years ago probably
didn’t enjoy them too much. Constantly red eyes
– probably the most frequent association with rigid
However, since then technology of manufacturing RGP
contact lenses (rigid gas permeable lenses) improved
significantly and the situation has changed for the better.
Many researchers agree, that RGP lenses are superior to
lenses, particularly to conventional (not disposable
soft contacts). Conventional lenses are thicker, don’t
contain enough water and don’t let through enough
oxygen for healthy
RGP lenses advantages
the greatest possible vision correction. No
other method of correction of sight produces such
result. The reason is that every person’s cornea
has some "roughness" of a surface. The soft
lens takes the shape of the cornea, while RGP lens
creates a perfectly smooth optical surface.
Second, when you
are exposed to the wind or very low humidity
(mountain skiing, riding a bicycle, hockey,
in a plane, etc.), the forward surface
of a lens dries up, and it changes its
optical power. The result is simple: the
person sight isn’t very clear and
the eyes feel uncomfortable until you
restore the moisture in your eye. RGP
lens doesn’t have this problem,
dry up on a wind and dry air, hence,
provides sharp vision all the time.
is also an issue. Your cornea receives oxygen only
from the atmosphere. Therefore any barrier between
an atmosphere and a cornea deprives it of oxygen.
Soft lens always is bigger than the cornea, covers
it like a bag, and prevents it from “breathing”.
Thicker the lens – bigger the problem.
Modern RGP contacts as the name suggests are made
of silicone-polymers, which has high gas permeability.
Even the best soft contact lenses let 5 times less
oxygen through than RGP lens. The only exception are
hydro gel soft contacts like Acuvue
Advance, their oxygen permeability is acceptable.
Besides, RGP lens is smaller then the cornea, so it
doesn’t cover it all.
Tears are very important for
the eye health because they wash off all alien particles
(a dust, a smoke, etc. They wash off bacteria as well.
Tears don’t have easy access under the soft
lens (because of its softness and large diameter).
On the other hand, RGP
actively moves in your eye, has smaller diameter and
provides tear access. Besides soft lenses evaporate
water from the surface, "extorting" tears
from an eye that can lead to its irritation. RGP contacts
do not demand additional moisture and "do not
extort" from eye moisture.
RGP lens life span is longer. It is usually good for
2 years, which makes it a much cheaper alternative
to soft contact lenses, which you have to dispose
RGP are much less affected
by protein build-ups than soft lenses.
It is always a problem with soft contacts, good solution
can reduce build-ups, but not prevent it. So with
soft contact lenses the only way to have your lens
always clean is to use daily
disposable contacts. RGP lenses made from a different
material and don’t contain any water at all.
As a result they stay cleaner for longer period.
RGP aren’t at risk
of drying (as they do
not contain any water). If you let a soft lens to
dry, you can throw it away, it is no longer usable
RGP contacts don’t
break as easily as soft ones.
Comfort has always been an advantage of soft lenses
over rigid. However, modern RGP are designed for the
maximum comfort for the eyes. They have a 5 - 7 days
adjustment period, but after that the cornea adapts
for the lens, and they feel as comfortable as soft