Table 1.

Quality of vision questionnaire

Parameter	Subscale question and response scale
Glare	1. How often do you experience glare? Never (0) – Very often (3)
	2. How severe is the glare? Not at all (0) – Severe (3)
	3. How bothersome is the glare? Not at all (0) – Very (3)
Haloes	4. How often do you experience haloes? Never (0) – Very often (3)
	5. How severe are the haloes? Not at all (0) – Severe (3)
	6. How bothersome are the haloes? Not at all (0) – Severe (3)
Starbursts	7. How often do you experience starbursts? Never (0) – Very often (3)
	8. How severe are the starbursts? Not at all (0) – Severe (3)
	9. How bothersome are the starbursts? Not at all (0) – Severe (3)
Hazy vision	10. How often do you experience hazy vision? Never (0) – Very often (3)
	11. How severe is the hazy vision? Not at all (0) – Severe (3)
	12. How bothersome is the hazy vision? Not at all (0) – Severe (3)
Blurred vision	13. How often do you experience blurred vision? Never (0) – Very often (3)
	14. How severe is the blurred vision? Not at all (0) – Severe (3)
	15. How bothersome is the blurred vision? Not at all (0) – Severe (3)
Distortion	16. How often do you experience distortion? Never (0) – Very often (3)
	17. How severe is the distortion? Not at all (0) – Severe (3)
	18. How bothersome is the distortion? Not at all (0) – Severe (3)
Double or multiple images	19. How often do you experience double or multiple images? Never (0) – Very often (3)
	20. How severe are the double or multiple images? Not at all (0) – Severe (3)
	21. How bothersome are the double or multiple images? Not at all (0) – Severe (3)
Fluctuation in your vision	22. How often do you experience fluctuation in your vision? Never (0) – Very often (3)
	23. How severe is the fluctuation in your vision? Not at all (0) – Severe (3)
	24. How bothersome is the fluctuation in your vision? Not at all (0) – Severe (3)
Focusing difficulties	25. How often do you experience focusing difficulties? Never (0) – Very often (3)
	26. How severe are the focusing difficulties? Not at all (0) – Severe (3)
	27. How bothersome are the focusing difficulties? Not at all (0) – Severe (3)
Difficulties judging distance or depth perception	28. How often do you have difficulty judging distance or depth perception? Never (0) – Very often (3)
	29. How severe are the difficulties judging distance or depth perception? Not at all (0) – Severe (3)
	30. How bothersome are the difficulties judging distance or depth perception? Not at all (0) – Severe (3)

Notes: The QoV questionnaire is a Rasch-tested, linear-scaled (0–3) 30-item instrument on three scales providing a QoV score in terms of symptom frequency, severity, and the degree to which the symptom is bothersome. McAlinden et al⁶ developed the instrument and consider it suitable for measuring QoV in patients with all types of refractive correction, eye surgery, and eye disease. The instrument and further details pertaining to its development can be found in McAlinden et al.⁶

Abbreviation: QoV, quality of vision.