If the eye doest move much you could use motion blur in the render tab. It basically rerenders the scene several times and sticks them in on top of each other to create blur. You can select how many timeslices (longer blur) to use.
And to select a colour to blur you could use a key node to isolate the colour you want to affect (as the glow node simply chooses based on brightness), then apply a glow to that then mix node that over the original.
An Echo node would be handy for the trail effect tho’.