i have the at pro and was wearing regular sunglasses bought at the store and the polarization in them makes it hard to read the vdi . then i tried the HD sunglasses that are amber in color , to my surprise it takes the glare out from the sun but you can still read the vdi numbers . if you have problems reading the vdi try them , they sell on ebay between 2.50 to 6.00 free shipping or walmart for 10.00