The sight test fee Need for more cautious analysis

doi:10.1136/bmj.309.6965.1370

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J M Gardner

Department of General Practice, University of Leicester, Leicester General Hospital, Leicester LE5 4PW

EDITOR, - D A H Laidlaw and colleagues describe the effect of the introduction of the sight test fee on the number of referrals to Bristol Eye Hospital.1 They use the numbers of referrals for 1984-8 to predict the expected numbers of referrals in 1989-92. This use of their data would have been appropriate if the introduction of the fee on 1 April 1989 had been made without prior warning. …