Lens Filter/Category Guide

Filter category

Description

Usage

Additional information

0

Light tint sunglasses or
fashion spectacles

No glare reduction,
some UV protection

1

Limited protection
against sun glare,
some UV protection

Not suitable for
driving in twilight
or night; OR not
suitable for
driving at night
or under dull
conditions

2

General purpose
sunglasses

Good protection
against sun glare, good
UV protection

3

High protection against
sun glare, good UV
protection

4

Very dark special
purpose sunglasses –
very high sun glare
reduction

Very high protection
against extreme sun
glare, good UV
protection

Not suitable for
road use and
driving