ForumsAdvertising, Sales and Marketing

Marzipan raises a good point about the location. I suppose you need to know the surrounding area to know what is the best color to help grab attention.

I am not a signage expert, but have worn glasses and contact lenses for practically all my life. First and foremost, the sign should have a professional feel too it - nothing too splashy (e.g. bright yellow, etc.). But, at the same time, not too sterile (e.g. stark white & black). When customers and potential customers look at the sign, they should get the impression that the Optometrist shop is clean, reputable, friendly and professional. I hope that helps.

As a designer, I also recommend good contrast.

SCORE 17, As you know, Signage is any kind of graphics created to display info to the audience,
on the street, inside and outside of buildings.
Think of the Las Vegas Strip. If you google "Signage", you will find many listing
of companies that be of service to you and your client.
Good luck, LUCKIEST