What is local anaesthetic?

Some articles on local anaesthetic:

Tenon's Capsule - Sub Tenon's Block For Ophthalmic Surgery
... Local anaesthetic may be instilled into the space between Tenon's capsule and the sclera to provide anaesthesia for eye surgery, principally cataract surgery ... After applying local anaesthetic drops to anaesthetise the conjunctiva, a small fold of conjunctiva is lifted off the eyeball and an incision made ... the incision into the periscleral lymph space and a volume of local anaesthetic solution is instilled ...

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