When you wear the Chameleon Suit, you have to be standing still for it to work. So before you get too close to a guard or a dog, begin to stop. Wait until they have gone away before you begin moving again.
(see related question)
you turn invisible by putting on the chameleon suit on and not moving
you have to stay still or it doesn't work
On the eye test just do the opposite of the sign he gives you. Then you can get the chameleon suit.
You can only wear the chameleon suit on Spy Island.
Read the emporers new clothes.
If you are wearing the Chameleon Suit, just stop moving before he reaches you. By the time he hits you, it is too late to become invisible.
He is being held in the warehouse, and the only entrance is on the roof, guarded by B.A.D. goons. You will need the Chameleon Suit to slip past them, as it is designed to make its wearer practically invisible. (see related question)
if you have the chameleon suit, you don't need an eye exam.
Three. Slip past them by running when they turn away, and stop to become invisible. (In order to reach the inside of the docks, you already have the Chameleon Suit.)
The invisible "Chameleon Suit" can be acquired at Spyglass Eyewear. Go to the store and ask for an eye test. When the doctor points at a figure, choose the one that is the opposite of it (M instead of W, E instead of backward E, etc.). He will go upstairs and you can enter from the outside door. Dr. Spyglass is working with the "good spy" agency and will give you the Chameleon Suit. Use it to get past the guards and dogs to rescue the first spy, being held prisoner at the docks left of Main Street.
You can't reach the rooftop door to the docks, much less get past the guard dogs inside. That is, unless you have the special Chameleon Suit which renders you invisible. Get the Chameleon Suit from Dr. Spyglass at Spyglass Eyewear. (see related question) To avoid detection with the Suit, stop moving when you see an approaching guard or dog, to give yourself time to blend into the background. Once they pass, you can move again. The safe holding the First Spy has a hole in its ceiling to enter through. (see related Chameleon Suit question)
go to the docks