| Preseptal cellulitis | Orbital cellulitis |
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*RAPD (Relative Afferent Pupillary Defect): When a light is shined alternately into each eye, the pupil on the inflamed side begins to dilate instead of constricting like the pupil on the healthy side. |
Eyelid | Erythema, oedema, ptosis | Erythema, oedema, ptosis |
Conjunctiva | Normal or erythema, chemosis | Erythema, chemosis |
Pupillary reactions | Normal | Normal or RAPD+* |
Vision, colour vision | Normal | Often reduced |
Proptosis (protrusion of the eyeball) | No | Often yes |
Eye movements | Normal | Restricted movement, pain on movement |
Fever | None or mild | Often yes |
Inflammatory laboratory values | Slightly elevated | High |