Table 1

Benefit matrix based on Yager’s decision theory16

Benefit levelItem area
1
  Disability		2 Cataract
symptom		3
  Activity		4
Car driving		5
Off sick?
5 Very good+++/±0+/±0 +/±0
4 Good++
3 Moderate+
or±0+
2 Questionable±0
or-+ +
1 No benefit -

  • In benefit level 5 an improvement of at least one of item areas 3, 4, or 5 is demanded. A conservation of a preoperative activity (= an activity ranking sum < 24 or being a car driver or not being “off sick”) is equal to an improvement in this benefit matrix.