Analysis of a progressive addition lens population.

Analysis of 98 progressive addition lens (PAL) wearers was undertaken using both mailed questionnaires and by assessing patient records. Statistical analysis was undertaken to investigate the nature and dependent variables of a PAL population. The PAL patients were from the Aston University undergraduate optometric clinic. Social survey techniques, such as the use of personalized mail, first-class stamps, and follow-up letters, were employed to produce a high return rate for the questionnaire. The number of returned questionnaires reached 89.9% of those originally sent which may be considered to be highly representative. The clinical survey showed the success rate for the undergraduate clinic to be either 85.7% or 80.6% depending upon the criterion for successful wear.