<prompt> Atropine is substituted by phenylephrine to facilitate fundus examination when?Mydriasis required without cycloplagiaCycloplegia is requiredMydriasis and cycloplegia both requiredCycloplegia and mydriasis both are not required  <response>: Ans. is a i.e., Mydriasis required without cycloplagia o Anticholinergic drugs atropine cause i Mydriasis ii Paralysis of ciliary muscles cycloplegia o Adrenergic drugs phenylephrine cause i Mydriasis ii Has no action on ciliary smooth muscles -- no cycloplegia For fundoscopy only mydriasis is required no cycloplegia is required -- Phenylephrine is preferred over atropine. 