I don't really know the section i should post this but Mod you can move to the appropriate section.


Approach, Ask, Assist.
Approach: if you suspect someone may need a
hand, walk up, greet them and identify yourself.
Ask: "Would you like some help?" The person will
accept your offer or tell you if they don't require
assistance.
Assist: listen to the reply and assist as required.
Not all people who are blind or vision impaired
will want assistance - don't be offended if your
assistance is not required.
Address people who are blind or have low vision
by their names so they know you are speaking
to them.
Let the person who is blind or have low vision
know that you have entered the room.
Do not walk away from a person who is blind or
have low vision without indicating that you are
doing so - it is embarrassing and frustrating to
talk to thin air.
Let the person who is blind or have low vision
take your arm as described in the sighted guide
fact sheet.
In dangerous situations say " STOP " rather than
"LOOK OUT"
Do not relocate objects or furniture without
telling the person who is blind or has low vision.
Do not fill glasses or cups to the brim.
Use ordinary language when directing or
describing and be specific. Do not point, or say
"over there". Direct people who are blind or have
low vision to their left and right, not yours.
Use words like "look" and "see"; they are part of
everyone's vocabulary. Otherwise both you and
the person who is who is blind or have low vision
will feel awkward.
Describe the surroundings and obstacles in a
person's pathway (remember to look up as well
as down). Warn of the presence of over-hangs,
such as kitchen cupboards, jutting side mirrors
of cars, or trees.
Do not leave doors ajar. Close them or open
them fully.
Be aware that the person who is blind or has low
vision will be disadvantaged by not seeing what
is going on. Therefore talk about what is
happening.
Ask people who are blind or have low vision what
they want or need. Do not direct questions
through their companion.
If people who are blind or have low vision extend
their hands to shake, do so.
When seating people who are blind or have low
vision, put their hands on the back of the chair
and they will then be able to seat themselves.

http://www.visionaustralia.org/living-with-low-vision/family-friends-and-carers/tips-for-assisting-people-who-are-blind-or-have-low-vision