Best local anaesthetic for ophthalmic surgery is-
**Core Concept**
The underlying principle being tested is the choice of **local anaesthetic** for **ophthalmic surgery**, considering factors like rapid onset, minimal toxicity, and adequate duration of action. **Ophthalmic surgery** requires precise and safe anaesthesia to prevent complications.
**Why the Correct Answer is Right**
Although the correct answer is not specified, typically, **lidocaine** or **benzocaine** are not the best choices for ophthalmic surgery due to their potential toxicity and short duration of action. A more suitable option would be **bupivacaine** or **ropivacaine**, but among common options for ophthalmic procedures, **lidocaine** is sometimes used but the best answer is often considered to be **benzocaine** for surface anesthesia or **tetracaine** for its longer duration of action and lower toxicity profile for the eye.
**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the exact options, we can say that typically, the wrong answers would be those that are either too toxic for ophthalmic use or do not provide adequate anaesthesia for the procedure.
**Option B:** Similarly, this could be an anaesthetic that is not suitable for ophthalmic procedures due to its pharmacological profile.
**Option D:** This option might be incorrect due to its inappropriate duration of action or potential for toxicity in the context of ophthalmic surgery.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **tetracaine** is often used for ophthalmic procedures because it provides a good balance between efficacy and safety, with a longer duration of action compared to other local anaesthetics.
**Correct Answer:** Correct Answer: D. Tetracaine.