67 Comments

  1. Wow! Great explanation and animations!

  2. Thank you Dr.Root
    Your presentation is very helpful and simple as you usually do..
    keep good work up and thanks again.

  3. mortezashamsizadeh says:

    Thank you Dr Root for your good and scholar presentation

  4. DR.root fan says:

    Dr.root a salute to u.wat an amazing job you have done.sir please continue to do this noble work by giving out these great informative and intereting lectures.thank you.hope to meet you some time in the future.thank you again

  5. Dr. P class at ACC Anaheim says:

    Great explanation and we enjoyed your lecture! Thank You

  6. it is more than great video.you simplified many obstacles.thank you very much.

  7. well i am just 14 years old and i dont get the explnation so lets hope next time

  8. GREAT PRESENTATION THANK YOU DR ROOT

  9. Wahyu Raharja says:

    This was a great works and did a a tremendous help in teaching our student to understand this topic.

  10. Hi Dr.Root
    In the frist I want say thank you for your lectures
    I have a question when we do the glasses to the patient we but prism in front of the natural eye or in front of the eye in which have tropia
    Thank you

  11. dr,zainab says:

    Thank you very much for your nice videos

  12. thank you for you intrsting lecture but we need more lecture to cover all point about squint

  13. superb!!!! Simply the best

  14. magnagiled says:

    Thank you so much.This’s very usefull for my study.

  15. sonykjose says:

    simplified the basics of squint.can u add some more lectures about squint.

  16. u r great sir. all dr teachers should like u. thank u very much

  17. Thanks so much! Great video for distinguishing between phoris and tropias.

  18. Dr.Root
    I learnt retinoscopy prety well with the help of your video and now the difference between Tropias and Phorias. Your explanations are simply simple. Thank you so much.
    Sir, I wish to see a animated/live demo of usage of JCC (Jackson’s cross cylinder).
    Thanking you once again.

  19. thank you very much for your excellent video

  20. Wow great video! Thanks

  21. I would like to point out that a you defined a tropia as a misalignment that is always there. A trope can be also be intermittent, and therefore not always there.

  22. @ Aaron:

    Thanks for the feedback. I purposefully kept the definition of tropia as simple as possible. You are correct, in that you can also have an “intermittent tropia.” You can also have an alternating tropia, convergence-related tropia, and many other “types” of tropia/phoria depending upon how you like to name things.

    When I put this presentation together, I felt it safer to avoid these nuances. I feared that discussing the intermittent nature of phorias/tropias would muddy the waters for the beginner and make the primary difference (between phoria and tropia) that much harder to grasp.

    Thus, the definition I used is simplified … but still useful and valid for a beginner. Perhaps I’ll go into further detail in a future lecture. Thanks!

    Tim Root

  23. Thank you!! I am a medical student and i now can totally understand tropis and phoria. hope i can make a Mandarin version in the future. Love your work~~!!

  24. i will like to know the difference betweent phorias and tropias.thank u.

  25. Hi Tim,

    Great lecture, very easy to follow. however i am a little confused as to what you meant by a ‘right esophoria’ (mentioned towards the end of the lecture). Ive always understood phorias being a bilateral misalignment of the visual axis, however you could have an esophoria which breaks down to alternating esotrpia…then breaking down further to maybe a right esotropia as the eyes fatigued with time.

  26. superb sir. amazingly simple presentation.

  27. Tulika Gupta says:

    thank u so mch sir ..ur lectures r so marvellous
    .They should be a part of the curriculum..

  28. langat christopher says:

    Thanks alot Dr Root.
    You really equiped me with ellaborate informations.
    Keep it up.

  29. great presentations,you have fans in morocco

  30. Rahul Navani says:

    you are the best sir…always checking this site…please keep adding more…we tuely love your efforts

  31. thank you so much DR ROOT &thanks GOD you are there for me am so greatful for your effort to make ophthalmology easier for us.

  32. Sadaf Shah says:

    Amazing! Thank you sooooooooooooooooooooooooooo much!

  33. Por favor… que sea en español!

  34. THANK YOU SO MUCH DR. ROOT

  35. Thanks alot Dr Root . Iam medical student from egypt and I love your videos alot

  36. chidinma ogu says:

    keep it up dr root

  37. what are the yoke muscles involved in dextroelevation?? please give some explanation as well

  38. Michael Ragaee says:

    A special thank you Doc & two thumbs up … YOU ARE GREAT.

  39. tibebu kassie says:

    its a very nice video& lecture that i appreciate………

  40. Sandeep Rohatgi and Dr V.S. Rohatgi says:

    thank you for the care and Great work Doc we appreaciate your concern keep Posting them

  41. Melissa Tucker says:

    I have just returned to COA after 15 years away. Your videos have been a lifesaver!!! Thanks so much for posting these, I’ve watched every single one!

  42. dr. pawan says:

    fantastic videos lot of conceps cleared thnks

  43. I’m a optometies in china,I love your thinking,it help me know something more easy.I try to translate your lectur. I think it will be very helpful.I hope that you can give me some advice。

  44. nsowah,Optometrist Ghana says:

    Thank you root for the lecture and video simplified

  45. Amazing video Dr Root! Big fan from Australia, loving your work!

  46. it was a nice video . thank you so much to upload this video..

  47. Do u incorporate a prism into a spectacle,is it possible? And how is it done. Thank u

  48. amany rabie says:

    thanks Dr.Root the lecture was very helpful and useful

  49. Gerard Lynch says:

    Simplicity is a difficult art and you complete mastery of it.

    Thank you

  50. hi may I ask how does our eyes synchronize and how does a cross-cover test break the fusion?

  51. Sakina Masud says:

    Thanks for giving us such an difficult topic in a simple and easy way, otherwise it was not clarified to me since last two years in ophthalmic classes

  52. chitra jha says:

    Hi Dr Root ,
    amazingly simplified explanation …
    thank you
    keep posting !!!

  53. Aboudkareem Noor says:

    Nice presentation that makes ophth interesting
    Thanks Dr

    Pls can you post for us qns…??

  54. I will always refer to your videos when in doubt and/or need a “refresher” course on a topic. Thank you for your awesome videos, they help in more ways than one! In the future (or if there is a video already made and I’m just not finding it), a tutorial on what the prisms would look with patients dx w/eso, exo etc.. would be super helpful! Again, your videos are always appreciated.
    Thank you Dr.Root

  55. I would like to recommend adding corneal reflections first before anything else, then doing a cover test and then looking at extra ocular movements. Orthoptic skills come from a cover test primarily and then EOM smooth pursuits complete the picture.

  56. Thingujam Sanatombi says:

    🤩Wow Thanks you Doctor I can understand easily

  57. Entesar Altalhi says:

    Sehr viel Arbeit und viel Mühe dahinter gesteckt, vielen herzlichen Dank Dr. Root.

    War sehr hilfreich.

    Thank you very much !

  58. Syeda Abeeha Zahra says:

    woah u made it so easy for me I was fed up with this topic, THANK YOU SO MUCH MAN!!

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