Thursday, October 10, 2013

Miosis & Mydriasis mnemonic

Hi everyone!
Eye see you reading this post.. EYE see you, get it? ;)
We are learning about the eye today, isn't that spectacular? =P

We should stop using ophthalmology puns, they are way too cornea! :D

Let's get started, seeriously!

What is miosis?
Constriction of the pupil.

What is mydriasis?
Dilation of the pupil.

MyDriasis has a D, D for dilates the pupil.

Mydriasis is a bigger word, so it stands for big pupil (dilated pupil).
Miosis is a smaller word, and therefore is a constricted pupil. 

Nerve supply:
Parasympathetic axons innervate the iris sphincter muscle, producing miosis.
Sympathetic nervous system supplies the iris dilator, composed of radially arranged muscle fibers, producing mydriasis.

How do I remember this? @__@

I am really scared of ghosts, they stimulate my sympathetic nervous system (fight, flight or fright response)
Ghosts show up at night, when there is low light.
Pupils dilate in low light, when my sympathetic nervous system kicks in.
Sympathetic nervous system dilates the pupil!

Sympathetic nervous system dilates the eye (Mydriasis) mnemonic

That's a silly association I use to help me remember.
Hope it helps! ^__^

That's all!

Ghost be like, "I feel you creeping, I can see it from my shadow"



  1. MiOsis sounds like MOrfine, therefor pinpoint

    1. Oh haha yes! Thank you for sharing this with us :D

      We have an entire post on morphine and related drugs here -->

    2. Thanks yaar.. Its very helpful..

  2. So helpful!! Thank you so much

  3. what's normal pupil size?


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