What’s the difference between lid abscess and orbital cellulitis?

on naked eye examination , both diseases present as red swollen eye

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Answer:
Orbital cellulitis typically has pain on eye movement, while lid abscesses (like a chalazion/hordeolum/stye) don't. There's still preseptal cellulitis, which falls somewhere in between — it has no pain on eye movement but more widespread swelling than a simple lid abscess.