Possible to see; perceptible to the eye. That can be seen; perceptible by the eye. ...

Does perceptible mean noticeable?

Something perceptible is noticeable, even if just slightly. A perceptible noise can be heard. You perceive through your senses, and things that are perceptible can be perceived; you can sense them.

What means by visible?

1 : capable of being seen : perceptible to vision particulates visible to the naked eye. 2 : situated in the visible spectrum visible light.