Facial palsy

How to differentiate between bilateral UMN facial palsy and Bilateral lower motor neuron facial palsy clinically only?

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Emotional fibres spared in b/l UMN facial palsy and affected in b/l LMN facial palsy . Corneal reflex is present in b/l UMN palsy and absent in b/l LMN palsy
Thank you Sir. will the presence or absence of bells phenomenon be of any significance? I mean will bell's phenomena be present in umn lesion? Also, isn't corneal reflex is a superficial reflex. So it should be absent in umn lesion, isn't it? Kindly clarify these two points.
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In both one side of face followed by other side except no involvement of occipitofrontalis nerve
If umn lesion is bilateral no sparing of upper half of face will be there.
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