There are many types of lens material available. There
are materials that range from lenses that can thin out a stronger
prescription to change different colors when you go from indoors to
outdoors.
Plastic or CR-39
This material can be used for any prescription, although
higher prescriptions can be a little thicker. It can be tinted any
color or have any lens coating applied to it.
Polycarbonate
This material is an impact-resistant material. It is
recommended for children's glasses, safety eyewear and for people who play
impact sports like racquetball. It tends to give lenses a lightly
thinner look and is slightly lighter than plastic lenses.
High Index Material
This material is a thinner, lightweight plastic especially
for people with higher prescriptions. There are several different
types to choose from, so talk to your optician about which type will work
best for your prescription.
Changeable Tints
There are lens materials that can change color when you go
from indoors to outdoors. This material provides you with two pair of
glasses in on clearer lens- indoor and sunglasses outdoors. They can
come in two types of materials, glass or plastic. They can come in a
variety of tints, from gray to green or purple. If you would like more
information about these colored lenses, go to http://www.sola.com.
Glass
This material is usually used for its excellent ability to
change tint when going from the indoors to outdoors. It is also good
for its ability not to scratch easily. It does make a lens more heavy
than other materials an it is not as shatter resistant as the other
materials.
