Board Thread:The Flash discussions/@comment-9346948-20160420004341/@comment-28166566-20160421152652

Of course. For example, when barry focuses on using a great amount of speed, his eyes fill with yellow sparks, Eobard is similar but his eyes glow red and seems to occur whenever he uses his speed, and zoom has black eyes and is covered in blue sparks. My conclusion is that when they access the speed force to go above normal speeds or just to move fast, the energy they build up creates a discharge of excess energy (sparks glow or black eyes) or the build up simply makes these effects visible due to energy concentration. My guess as to why zoom gets black eyes is because of the side effects of v9 and his use of Alot of speed force, although 'jay' had yellow sparks similar to barry, but that may be because he wasnt going too fast to prevent his lightnng turning blue.