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mydriasis and mydriatic drugs.

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AQA GCSE physics P1 unofficial mark scheme 05-05-2016
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    hellew. Two of my lecture pages are contradicting eachother. I shall type the exact words it says.
    on one lecture page it says:-
    "dilator pupillae - smooth muscle arranged radially- stimulation of sympathetic fibres---> contraction of radial muscle---->dilation of pupil = mydriasis.
    but on another lecture page it says:-
    Mydriatic drugs
    Muscarinic antagonist
    atropine (tropicamide) - passive mydriasis (loss of mitotic drive to constrictor pupillae)

    is mydriasis the dilation of pupil or the constriction on pupil?
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    Parasympathetic innervation constricts pupil (occulomotor nerve)...

    Blockade of parasympathetic innervation (by atropine) dilates pupil...

    This is passive dilation (passive mydriasis)...

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    sorry :s:


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