Analysis of a progressive addition lens population

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