Table 2.

Assessment of individual symptoms and signs

Score	Description
Itching*
0	Absent
1	An intermittent tickle sensation involving more than just the inner corner of the eye
2	A mild continuous itch (can be localised) not requiring eye rubbing
3	A definite itch, the subject would like to be able to rub eye
4	An incapacitating itch which would require significant eye rubbing
Tearing*
0	Absent
1	Mild (eyes feel slightly watery)
2	Moderate (occasional need to wipe eyes)
3	Severe (tears rolling down cheeks)
Redness†
0	Absent (vessels normal)
1	Mild (some vessels definitely injected above normal)
2	Moderate (diffusely red eye with individual vessels dilated but still discernible)
3	Severe (intensely red eye with intensive dilatation of conjunctival vessels which are still but not easily visible)
Eyelid swelling†
0	Absent
1	Mild (lids are a little puffy)
2	Moderate (frank swelling of upper and lower lids)
3	Severe (eyelids are swollen)
Chemosis†
0	Absent or visually not detectable
1	Visually evident, raised conjunctiva especially at limbal area
2	Ballooning of conjunctiva

*Assessed by subject; †assessed by investigator.