Do I need to move the child to the front of the room?

Generally this is not necessary although some children benefit from this if you stay fairly stationary in the front of your room. This is because with fewer children between you and the child there are less possible distractions for the child. As well, the volume of your voice and the size of your movements and gestures are larger, which helps the child in question attend better. If for any reason there is an optical reason that is causing a decrease in visual acuity, most frequently lenses will be prescribed to improve visual acuity to at least the 20/40 level, which should allow a child to see anything of import from any place in your classroom.