Going forward, the Optician Index will report the monthly changes in the independent market sector for the UK, including regional chains and highlight the trends. With regard to the data, because it is indexed, reporting the percentage change in indexed values, we use a 'normalising' process which enables the make-up of the sample to change without affecting the historic data. Comparison with the previous month and that of one year earlier is, therefore, still relevant.
However, it should be noted that we also report key performance indicators as real values or percentages and some of these see a step change this month as a direct result of the changes in the sample.
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