Table 1: Ocular surface diseases severity grading and pain score.
|4||Severe pain (awakening in the night due to pain) 6 times a year or more|
|3||Severe pain for less than 6 times a year or moderate pain (soreness early in the morning or during the day) for at least 6 times a year|
|2||Moderate pain for less than 6 times a year|
|1||No pain or foreign body sensation|