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Br J Ophthalmol 1997;81:1026 doi:10.1136/bjo.81.12.1026
  • Editorial

Colour for time; charting the fourth dimension

  1. JEFFREY L JAY
  1. Tennent Institute of Ophthalmology, University of Glasgow, Glasgow G11 6NT

      The pointwise linear regression (progressor) technique for visual field analysis and display, described in this issue (p 1037) by Viswanathan et al, deserves consideration beyond the comparison of its sensitivity with thestatpac 2 program. Is it a fashionable solution which has yet to find its problem; yet another technical complexity offered to a medical market often driven by the interest of suppliers such as instrument manufacturers, drug companies, and research workers? Or is it a potentially valuable innovation?

      In their introduction the authors summarise the difficulties in detecting significant progressive visual field deterioration. Perhaps no individual digital or mathematical expression can combine all the information required and for many clinicians visual inspection of a graphical display is still the easiest method of rapid and reliable interpretation. The progressor offers a single visual display which adds change in visual field sensitivity over a period …

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