Differences between conjunctival and ciliary congestion

S. no. Feature Conjunctival congestion Ciliary congestion
1. Site More marked in the fornices More marked around the limbus
2. Colour Bright red Purple or dull red
3. Arrangement of vessels Superficial and branching Deep and radiating from limbus
4. On moving conjunctiva Congested vessels also move Congested vessels do not move
5. On mechanically squeezing out Vessels fill slowly from Vessels fill rapidly from
the blood vessels fornix towards limbus limbus towards fornices
6. Blanching, i.e., on putting one Vessels immediately blanch Do not blanch
drop of 1 in 10000 adrenaline
7. Common causes Acute conjunctivitis Acute iridocyclitis, keratitis (corneal
ulcer)