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A cycloplegic that is ideal for office use because it has rapid onset and short duration is

  1. Atropine

  2. Cyclopentolate

  3. Homatropine

  4. Tropicamide

The correct answer is: Cyclopentolate

Cyclopentolate is the correct answer because it is an ideal cycloplegic for office use due to its rapid onset and short duration. This makes it convenient for use during examinations as it quickly paralyzes the ciliary muscles and dilates the pupil for refractive error measurements. Atropine has a prolonged duration of action and is not commonly used for office procedures due to its long-lasting effects. Homatropine also has a longer duration of action compared to cyclopentolate. Tropicamide has a rapid onset like cyclopentolate but has a shorter duration of action, making it suitable for diagnostic procedures but not ideal for cycloplegic refraction in a clinical setting.