A portable transistorized television set as a distance fixation target for both adults and children has been used clinically. The novelty of this apparatus is enhanced by turning off the audio portion of the set. Such a device is readily available, inexpensive, and easily serviced.
Weaver JH, Oliver DS. Television as a Distance Fixation Apparatus. Arch Ophthalmol. 1973;89(6):503-504. doi:10.1001/archopht.1973.01000040505013