Statistical correlation
| Type of correlation (before and after therapy) | p Value |
|---|---|
| Impression cytology/plasma vitamin A level | <0.0001 |
| Impression cytology/adaptometry | <0.0001 |
| Adaptometry/plasma vitamin A level | <0.0001 |
| Corneoconjunctival alteration/plasma vitamin A level | <0.01 |
| Impression cytology/age | NS |
| Impression cytology/nutritional status | NS |
| Impression cytology/time since surgery | NS |
| Impression cytology/percentage weight loss | NS |
| Impression cytology/ocular symptoms | NS |









