Atropine is substituted by phenylephrine to facilitate fundus examination when?
Mydriasis required without cycloplagia
Cycloplegia is required
Mydriasis and cycloplegia both required
Cycloplegia and mydriasis both are not required
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.