Our Other Websites:


Join our mailing list!

Do you want to know when we upload a new video lecture or chapter to Ophthobook? Then join our in-house email list. You’ll find the blue sign-up form on the left side of the page under the navigation buttons. These emails are:

  • Infrequent: I only send out an email once every few months
  • Secure: We store your email address on a secure server, and do not sell or relinquish it to spammers
  • Easy to unsubscribe: Every email has an “unsubscribe link” at the bottom

Next Expected Update:

“Relevant Eye Anatomy (Video)”
A review of ocular anatomy … with an emphasis on relevance in the real world of eye care.


i am student so i need (optometrist)so i need information about astigmatism and classification by meridian and refractive error ok by

Tim Root: Ali, you may want to check out the Optics Chapter Video … it talks about astigmatism and meridians.

Comment by ali — July 17, 2011

Please expand on your comment that you use your trusty second instrument to protect against posterior capsular rupture. I was unaware that the Connor Wand was gentle enough to hold back the capsule by itself.

Tim Root: I use the straight Connor wand almost exclusively for my second instrument. I wouldn’t rely on it exclusively to hold back the capsule, as the round tip is small and could bluntly rip through the capsule with any major surges (especially if there are any scratches on the end from mishandling).

Instead, I spin the straight Connor 90 degrees, and hold it in this side position (see this drawing).

I then hover my Connor tip under my phaco tip (and under the fragment I’m removing … as in this photo). If there is a surge, or the fragment phacos out fast, the connor keeps the capsule from billowing up into my phaco tip. This position is hard to maintain with the bent Connor as you can’t spin it in your fingers.

In general, I think it best to NEVER touch the capsule with ANY instrument. I view the Connor wand as a final safety bumper … of the two instruments (Connor and Phaco Handpiece), it’s the one that is least likely to break the capsule. I was taught this safety technique during residency, and it’s saved me several times.

Comment by Alan Carlson — August 30, 2011

ur work is really unique
ur lectures are very informative
i get a lot of knowledge from ur lectures
and ur cartoons animation in lectures is very nice and informative

Comment by uzma — September 3, 2011

i reuest
plz also leave brief videos about complete pathology of eye on youtube
such ac retinitis, ectesia , staphyloma, keratitis,conjunctivitis, scleritis,etc

Comment by uzma — September 3, 2011

I like your web pages. When I have a time, I usually go there to find out more information I need in English for my career.
Thank you very much for your helpful webpage.

Sincerely yours,
Kieu Thi Thinh

Comment by kieu thi thinh — September 29, 2011

im an optometry student and i rly find your site very helpful with anatomy of the eye and even more interesting is the pathology chapters, thnx the free knowledge

Comment by maite letswalo — October 23, 2011

hello sir, i am student and i want to know about how th perform refraction in refractie error patient, as myopic astigmetism, and hyperopic astigmetsism patient

Comment by neelam — October 29, 2011

I am a 2nd year student of Optometry (distance learning). Your lecture on Glaucoma, Retinoscopy and misaligned eye were very helpful. In fact Tropias and Phorias are clear now and I am doing Retinoscopy effectively now. Thanks a ton. One of my fellow senior student suggested JCC to be very effective tool for finding correct cylender and its axis, but he stays far off. I am unable to use JCC properly. Please help.

Comment by Anant V. Lakhotia — November 17, 2011

try to make more animated ones more. to understand easily

Comment by anvesh — December 2, 2011

hi sir i have completed d.opt and pursuing b.opt distance pl help me some notes retinoscopy ane low vision aids. Thanks regarads ranjit singh

Comment by ranjit singh — December 16, 2011

Dear Dr.Root
I am a medical student and have just finished the ophthalmology ward. My exam will be in three days and I regret that I haven’t find your site sooner!I wish I were one of your lucky students!thanks for every thing I learned from you 🙂

Comment by Marzieh — February 16, 2012

hello. I am student optometry . very good .you have

Comment by azad sanginabadi — February 24, 2012

dear sir,
I want to know about epephora(watering of eye
please show us video about watering of eyes.
Ophthalmic tech;

Comment by tajammalhussain — March 15, 2012

Dr. Root,

Incredible, having fun while learning! I am the Director of Education at Houston Eye Associates and am putting together our own in house OA program. I too am trying to fuse learning with fun components so our students will remain engaged. Your videos will be a great addition. Thank you for being YOU! I am thrilled!

Comment by Jacq Williams — March 26, 2012

Dear Dr. Root

I’m a lecturer in an optometry department in Iraq and I’m interested about your “eye monster” that is used to recognize tropias and phorias.
I really want to know how can I buy such tools for teaching students when there are no chances to have some patients for testing.

Best Regards

Comment by Mehdy Alnawfel — April 24, 2012

Dear Dr. Root,
I am a first year Optometry student. I love your videos. I just want to thank you for a great information you give in the videos. I learn a lot from there.
I wish you have a great holiday season and make more videos for us.

Comment by Kelly — December 4, 2012

thank you for give us all these information but i m resident dr. and i need to know more details about ophthalmology by video from you

Comment by hussein — April 26, 2013

I am looking forward to updated videos and feature which are relevant to my job

Comment by dhk — June 11, 2013

Dr. Root,
this is very easy to learn

Comment by abhi — August 16, 2013

Leave a comment

Your Comment:

Copyright Root Eye Network Inc., All Rights Reserved