2. Eye injuries in the workplace are very common.
More than 2,000 people injure their eyes at work
each day.
About 1 in 10 injuries require one or more
missed workdays to recover from.
Of the total amount of work-related injuries, 10-
20 % will cause temporary or permanent vision
loss.
Experts believe that the right eye protection
could have lessened the severity or even
prevented 90% of eye injuries in accidents.
3. There are three things you can do to help
prevent an eye injury
1) Know the eye safety dangers at work-
complete an eye hazard assessment
2) Eliminate hazards before starting work. Use
machine guarding, work screens, or other
engineering controls)
3) Use proper eye protection.
6. These lenses are not very strong.
Able to withstand significantly more impact
than a standard glass lens.
These are made by cementing together two
pieces of glass with cellulose acetate.
By modern standards, these lenses could
hardly be safe.
The broken glass piece s are usually sharp
and potentially destructive.
7. Polarised laminated lenses are available
today, but are designed to provide safety.
Made by sandwiching a piece of polarising
material between pieces of glass.
Laminated glass safety lenses have not been
produced for many years.
8. The production of heat toughened lenses
begins by surfacing a thick glass lens.
A heat toughened safety lens needs to be
made thicker than a standard stock lens.
Heat toughened lenses are often said to be
safe.
Broken pieces are shaped like cubes and
blunt.
9. These lenses are somewhat thinner than the
usual heat toughened lens.
Can be identified with a polarizing strain
view.
This strain pattern is different than
conventional heat toughened lens.
10. In chemical toughened process, large batches
of cut lenses are first preheated .
Then these are immersed in the bath of
chemical( molten potassium nitrate at temp
of 440C) .
These lenses are fairly thin, extremely
regular and strong.
The process is fully automated, because the
chemical used are hot and dangerous.
11. Glass lenses
Are not easily scratched
Can be used around harsh chemicals
Can be made in your corrective prescription
Are sometimes heavy and uncomfortable
12. CR-39 refers to the material that is used to make the
majority prescription lenses.
It is an optical grade plastic polymer recognized for
its light weight, chemical resistance properties and
'tint-ability'.
In comparable prescriptions it is approximately half
the weight of glass lenses, while being slightly
thicker.
Its impact resistance is greater than glass but does
not rise to the level of polycarbonate
it is not recommended for active sports and
motorcycling.
It is more scratch resistant than polycarbonate, but
will scratch if not properly taken care of.
13. Polycarbonate is an impact resistant material.
It is becoming used more widely in recent times -
especially for motorcycling and action sports.
It is also used frequently for the glazing of
rimless frames because of these properties.
Although polycarbonate is impact resistant, it
should not be considered indestructible.
Polycarbonate is the strongest material available
and will have the tendency to break into larger
pieces, instead of the CR39's smaller pieces.
14. Polycarbonate is thinner than standard CR39.
Polycarbonate lenses are ten times more
impact resistant than other plastics making
them highly suitable for action sports.
They offer UV protection and stop 99.9% of
rays from the sun, fluorescent lights and
computer screens.
Our polycarbonate lenses are supplied with a
scratch resistant coating and are thinner than
standard lens and therefore more
comfortable to wear.
15. Polycarbonate
Strongest material
for impact
resistance
Lightweight
Can be coated for
scratch resistance
Most have built-in
UV radiation
protection
Plastic (CR39)
About one-half the
weight of glass
Resistant to
solvents and pitting
More choices for
coatings and tinting
