Authors' reply

BMJ 1996; 312 doi: https://doi.org/10.1136/bmj.312.7028.440c (Published 17 February 1996) Cite this as: BMJ 1996;312:440
  1. S P Harding,
  2. D M Broadbent,
  3. J P Vora
  1. Consultant ophthalmic surgeon Research fellow Consultant physician Royal Liverpool University Hospital, Liverpool L7 8X

    EDITOR,—Marie Hickey-Dwyer and Susan Ellerby contend that the calculations of sensitivity that we presented are misleading because the sensitivities for the detection of sight threatening retinopathy and sight threatening maculopathy by photography and direct ophthalmoscopy alone are similar, but they have not fully understood the data presented or their relevance. As any screening programme must recall patients in whom findings are ungradable any attempt to measure sensitivity or specificity that ignores this will give a false picture of effectiveness. When patients with multiple …

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