About this site

Hi, I am Sam Tapsell, currently a GP in North Devon, UK. I have a background of working in ophthalmology for 4 years, before heading into General Practice (GP)

I want this site to introduce ophthalmology to GP trainees. It should also be helpful to medical students and doctors starting out in ophthalmology, as well as others undertaking nursing, orthoptic or optometry training.

3 thoughts on “About this site

  1. Peter Assink (Nethelands)

    dear Mr. Tapsell,

    are you willing to answer a question about eye movement?
    I am not an eye doctor, just a university teacher interested in eye movement
    I have seen your(?) You Tube video called Actions of the ocular muscles again and again (a very clear and instructive video, thank you!!) but two questions remain.
    The first is: what are ex- and intorsion for? Or does it occur as a side-result of the muscular actions? When I look into a mirror while moving my eyes, I do not see the irises rotating: is that beacuse the rotation is being compensated for by antagonists?
    The second question is: if an eye is moving purely downwards (infraduction) what muscles are involved? I would say inferior rectus and medial rectus, is that correct? And purely supraduction should then be managed by superior rectus and lateral rectus? Together with the diagram in your video that would cover all possible eye ductions, including diagonal ones.

    I am interested in this matter because I am intruiged by the conscious control of these extraocular muscles as part of vision therapy.

    thank you for answering

    Peter Assink

    1. stapsell Post author

      Extorsion and intorsion, Why is a very good question!

      Here is a reference addressing this issue, which suggests that torsional saccades during head tilting reduce distortion of peripheral vision.

      Infraduction and supraduction are combinations of the two groups highlighted in the diagram.

      Supraduction is superior rectus and inferior oblique,
      Infraduction is inferior rectus and superior oblique.

      Hope that helps


  2. Anu

    Hi Dr. Tapsell,
    Your work is amazing ! I am an ophthalmologist in US .What is the best way to connect with you to discuss?Thanks


Leave a Reply to Peter Assink (Nethelands) Cancel reply

Your email address will not be published. Required fields are marked *