Pain intensity scoring system.
|Mild||Momentary mild sensations of burning or piercing||1|
|Moderate||Intermittent moderate sensations of burning, piercing, or fullness/tightness in the eye lasting a few seconds||2|
|Severe||Continuous sensations of piercing or swelling/stretching in the eye severe enough to require additional intervention||3|
|Unbearable||Continuous sensations of piercing or swelling/stretching of the eye severe enough to make the patient want to stop the procedure||4|