CiuffredaK.A new field expander: A preliminary report.Optometric Weekly, 1977, 68, 29–30.
2.
DrasdoN.Techniques, instruments, cases: Visual field expanders.American Journal of Optometry and Physiological Optics, 1976, Part I, 464–467.
3.
DrasdoN.Personal communication, September 13, 1977.
4.
HolmO.C.A simple method for widening restricted visual fields.Archives of Ophthalmology, 1970, 84, 611–612.
5.
HolmO.C.Visual field widening retinitis pigmentosa, a preliminary note. Paper read at Association of Research in Vision and Ophthalmology Atlanta Section Meeting, Duke University, November 1975.