Table 1 Diagnostic criteria [1, 2]
Grade | Status | Findings |
|---|---|---|
0 | Normal | No abnormal changes under the slit lamp |
1 | Slightly abnormal | Under the slit lamp, tiny sub-epithelial deposits can only be seen on the nasal or temporal limbus |
2 | Abnormal | Under the slit lamp, there are more obvious drop-like deposits, involving more than 2/3 of the cornea, and the cornea below the horizontal line of the pupil can be changed in a mist. |
3 | Significantly abnormal | The sediment is fused into a sheet, covering the cornea in a strip-shaped lateral direction, sometimes it can also be raised above the normal corneal epithelium, and the corneal surface can be seen with amber nodules |