Next to your rod and reel the most important piece of equipment you will have on a bonefishing trip are your sunglasses. Buy the best optical quality glasses you can afford. I prefer glasses that wrap around and block out side light while cutting out the wind.
There is some debate about the best color of glasses to have but on normal days I go with amber or brown, grey on extremely bright or high contrast days and yellow for low contrast, cloudy/ rainy days and at twilight.
Always take two quality pairs with you in case of breakage or they get lost. Make sure they are part of your carry on luggage.
Always carry a lens cleaning cloth and a cleaning solution, I use the prepackaged individuals eye glass wipes.