Implementation methods for vision related quality of life questionnaires

Area of Science:

• Ophthalmology
• Quality of Life Research
• Rehabilitation Science

Background:

• Assessing quality of life is crucial for understanding the impact of vision impairment.
• Standardized tools are needed to reliably measure quality of life in visually impaired populations.
• The Low Vision Quality of Life (LVQOL) questionnaire is a key instrument in this field.

Purpose of the Study:

• To identify the most reliable and consistent method for administering the LVQOL questionnaire.
• To determine the optimal time interval for implementing vision impairment quality of life assessments.
• To compare postal, telephone, and in-person administration methods.

Main Methods:

• 117 patients (aged 9-101) with low vision were grouped by age, sex, and visual function.
• Participants completed the LVQOL questionnaire via post, telephone, or in person.
• The questionnaire was administered on four separate occasions, four weeks apart.

Main Results:

• Postal administration was most cost-effective with highest internal consistency but yielded lower scores than other methods.
• Test-retest reliability did not differ significantly across the three implementation methods.
• A trend towards reduced quality of life scores at 3 months was observed but not statistically significant.

Conclusions:

• Mailed LVQOL questionnaires are recommended for clinical measurement of vision-related quality of life.
• Postal implementation is reliable, cost-effective, and unbiased, even for severely visually impaired patients.
• Quality of life can be measured up to 2 months post-rehabilitation without affecting baseline scores.