No need to related your message to the Visually Impaired Persons (VIPs) through his/her companion. Talk to the VIPs direct.
No need to sedulously avoid mentioning words or phrases like "to catch sight of", "to see (with)", "to watch TV", etc. when talking to the VIPs.
To the VIPs, silence is just like a sighted person having his eyes closed.
Take the initiatives to introduce yourself and anyone present to the VIPs. Inform the VIPs your departure before doing so.
Inquire the VIPs whether they need any assistance before offering the same.
Don't leave doors ajar. Keep passageways free from any obstruction.
Describe in details to the VIPs the environment of his/her residence and work place. Always keep in mind to tell the VIPs any rearrangement of furniture and items.
Guide the palm of the VIPs to the back of a chair and he/she will know where his/her seat is.
Let the VIPs hold your arm or forearm while walking with him/her and he/she can learn from your movement whether you are walking on a level path, or climbing up or descend a flight of stairs.
Describe direction to the visually impaired in a clear and definite manner. Don't point your finger to a certain direction and say "this side" or "over there". Instead, tell him/her it is in front of or behind him/her, on his/her left or right.