📍How To Do The FAMOUS Vision Therapy Exercise: Brock String Exercise

The brock string is one of the most helpful tools in correcting, and training vision. It does so much for those with poor vision, and that may be why it is the most famous vision therapy exercise! There are many ways to do this vision therapy exercise. Dr. Valerie Lam teaches us what does the brock string do, set up, common mistakes, along with 3 different ways to do the brock string vision therapy exercise.
Dr. Valerie Lam, from Insight Vision Center Optometry, teaches us the vision therapy exercise: The Brock String.
If you are interested in the brock string that we use, you can see it here:
www.emergentvt.com/free-kit
What is Vision Therapy?
Vision Therapy is a custom program of exercises to strengthen the eyes and brain to treat many vision problems and learning issues. Vision therapy is done under the guidance of an optometrist and with one on one coaching of a vision therapist. Here is an example of an exercise we use with our patients. Leave a comment below and let us know how you did!
⏲ CHAPTERS ⏲
00:00 Start
00:17 - Intro To The Brock String Exercise
01:20 - The Brock String
03:09 - How To Set Up
03:34 - Alternatives
03:49 - What Are Your Eyes Doing?
05:25 - Common Mistakes
05:57 - Level 1
12:46 - Training Tips
13:11 - Summary of Level 1
13:36 - Level 2
16:54 - Summary of Level 2
17:14 - Level 3
19:11 - Summary of Level 3
19:30 - Conclusion
19:46 - Brock String Exercise Written Levels
__________________________________________________________________________
Insight Vision Center Optometry offers a full range of optometry services for both children and adults. We offer vision therapy, myopia management, specialty contact lenses, and primary eye care services. We serve the Orange County region of Southern California. Visit our website to book an appointment!
►Vision Therapy PDF Charts For Downloading
tinyurl.com/visiontherapycharts
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3151 Airway Ave Ste M3
Costa Mesa, CA
92626
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[@Insightvisionoc]

Hello! Thank you so much for learning about the vision therapy exercise: Brock String. For your convenience, we have split the video into sections for your viewing experience. Feel free to use the video as a reference when doing the brock string exercise. Hit the sections, "Summary of Level 1, 2, 3" to quickly learn about the instructions for each different level of the brock string.

[@aliyaabbas507]

Hi doc i am from Pakistan how can i buy this brock string?

[@jermsbestfriend9296]

These exercises don't help with rotated vision or up-and-down strabismus, right?

[@bidaeva2696]

Bonjour svp, puis-je avoir ces vidéos en français c'est très intéressant.svp.merci

[@caroliniferreira3231]

I'm 27 years old, born with strabismus and I treat it ever since I was a baby. I have done the surgery and it all came back. I have NEVER heard this explanation, even with all the years of eye therapy. I just thought I was too messed up for seeing two strings coming from the point, as I would try my best on focus on it. You have no idea how I appreciate this video.

[@heysoultis4300]

Hellooo! Did the therapy work on you?

[@tango9944]

Thank you for showing the details how to do this exercise.

[@vafamf]

This was the best explanation of how to use a Brock string that I’ve come across. Very well done

[@Nongdamba500]

Keep the good work Doctor. 💐🍀🎋

[@sandrajohnson-erickson9968]

It is difficult for therapists to teach it like this. You have removed the holes I felt I was struggling with. Thank you.

[@innovatecoin9990]

Being born with cross eyed problems, I had surgery early on about 9 years old, I then suffered with lazy eye after did not attend dang therapy after the surgery. I’m shocked that these exercises were never shown to me by any of my eye doctors Finding all of this through self research I’m happy to have stumbled upon your video, please make a consumer version for these products! We surely could use them :-)

[@chidozieeboh4330]

This is super lovely. The Clinician is super skilled, and although Brocks is not so easy, she made it fun for the patient.

[@adamrocks529]

Thanks for this!

[@Phurba666666]

Great video, thank you

[@noraluzcalugas2731]

Welcome Dr Valerie Lam♀️🛡️🥰🌐🪻🫖

[@davidvranka5682]

Thank you. You are awesome

[@Jitowix]

Great video!

[@23andrelopes]

Thank you so much

[@standbymatt]

Thanks god i found this video. Have been known to this exercise for years, but never a clearer explanation than this to execute. Appreciate the sharing!

[@MackenzieHoffman]

Did you have a lazy eye? Has it actually helped? Do you no longer have a lazy eye?

[@chinaricanbeast5228]

You're amazing. I had complications post lasik five years ago and finally am taking steps to be more responsble with my eye care. Thanks for the files! I work fixing pianos + nursing so I have a lot of eye strain.

[@bruhkumar8407]

so how is it going with the exercises? I also am meaning to have Lasik next year, I too have double vision when I wake up and when I use mobile for long period of time(not laptop or pc). Did lasik bring your double vision?

[@maiytet]

I really need this therapy

[@ministerofjoy]

Thank you 🎉

[@joe8072]

Wow! That was great!

[@eddieerickson5908]

Just Started this vision Therapy this week [12-9-22} Hoping for balance improvement. Wish me success.

[@musicoscope]

excellent!! thank you!

[@Insightvisionoc]

You are welcome!

[@dianas8562]

Thanks

[@VeryMuchBlessed]

Excellent video. Very helpful and it's encouraging to know that it's possible to improve one's vision problems with therapy.

[@Insightvisionoc]

Thank you!

[@MackenzieHoffman]

Did you have a lazy eye? Has it actually helped? Do you no longer have a lazy eye?

[@baldeagle8597]

Tx for that.. I was totally not ready to pay for this

[@margovsko]

I was born with a lazy eye and I’ve noticed it appearing whenever I focus on something close or when I’m tired. I hope this exercise will help me control my left eye better. Thank you so much for explaining!

[@kantamaniteja3949]

The same thing is happening to me.. But recently I had surgery.. Now I have little bit only...Doing this exercise.

[@valerielam4064]

You're welcome! Hope that the exercise helps!

[@kantamaniteja3949]

@@valerielam4064 Hello mam! While doing Brock string exercise, sometimes I see V & X patterns.. What shall I do? If I see these patterns..Plz reply. I am from India.

[@DeniseSkidmore]

@@kantamaniteja3949 watch the video again until you understand it, it addresses this patterns.

[@TheNoWayJose9]

@@kantamaniteja3949 l Ku p. Kk Lon+

[@CuteGirl-dx5qh]

Nice video 👍

[@heatherwylie98]

Dr Lam, i love your vision therapy videos! I would gladly pay for a complete set of videos that cover all the therapies needed to ideally resolve major tracking with minor convergence insufficiency issues, and the sequence to use them in. Is there such a thing that you or anyone makes?

[@yoelflores6039]

Thanks for this video. What exercises do you recommend for amblyopia?

[@elizafeller3433]

Thank you so much! When I was diagnosed with eye convergence insufficiency we couldn't move forward with therapy because it was too expensive. I'll definitely be ordering one of those strings. Or maybe make my own. I'm creative enough I think lol

[@mohandassgnanasekaran2283]

great efforts, kindly give us any video of how to do this exercises for children of 3-5 years Thank you

[@arcadealchemist]

ok imma try use these i got new glasses to pick up but gonna see if it can help,.

[@sidrajavaid2170]

My daughter has been recomended this exercise thank you for posting now i know how to do it

[@MackenzieHoffman]

Did you have a lazy eye? Has it actually helped? Do you no longer have a lazy eye?

[@classyperson]

For about a yr I’ve been experiencing double vision, I didn’t go to the eye doctor until about 4 months ago he gave me a prescription for prism lens, I was excited thinking it would correct it, it didn’t help at all. I went back he prescribed stronger prism for distance, it seems when I’m outside or driving it’s worse, I’ve decided not to fill the new script I don’t drive much anymore and don’t want to spend the money. Some days are so bad, I will definitely try the exercises for double vision. Thank you

[@MackenzieHoffman]

Did you have a lazy eye? Has it actually helped? Do you no longer have a lazy eye?

[@tycox8704]

I have the same symptoms. Eye doc prescribed prism lenses but I feel they are just a bandaid. It’s been a year since you commented. Did you try anything else that improved your vision?

[@HauteModesty]

I’m so glad I found this. I’m training to keep both eyes open when I acquire a target during my shooting and this is exactly what I needed. QUESTION: Do you have to master Level 1 before you move to Level 2 or do we do that as separate exercises at different days, times, etc.? How does the level progression work and what is the goal for each level? Thank you!

[@MackenzieHoffman]

Did you have a lazy eye? Has it actually helped? Do you no longer have a lazy eye?

[@pravishachowdary8566]

Can u keep a video for vision therapy for divergence insufficiency

[@alanlopez3070]

many thanks on your videos. I have been diagnosed with intermitent exotropia and have used brockstring therapy. Recently I have been told that issue is not muscle but neurological and therefore exercise is no value. The basis of this assertion is that I can follow any pt. 360 degrees at will. Does this make any sense?

[@bisalbk7013]

nice

[@zarakhan6913]

I have diplopia since after gallbladder my surgery I have under treatment of neurosurgeon too

[@catchafire221]

Can't lie, I'm kinda jealous of people that just have normal vision. Trying this exercise doesn't work at all for me and just gives me a huge headache. Grew up with a patch, 2 surgeries, idek anymore :/

[@enfieldjohn101]

This was one of the first eye exercises that I had to do when an eye doctor discovered that I had binocular diplopia. I found it so difficult to do! I remember times when I'd be driven to tears trying to get it right, but my mom didn't let me give up, she pushed me to keep doing this and other eye exercises and they really helped. What's discouraging and worrisome to me now, is that now that I have parathyroid problems, even though I've had the surgery now, the condition has still affected the nerves throughout my body, including the ones that control my eye muscles to the point that my diplopia is getting worse again. I'm having to do these exercises more often than I did before the hyperparathyroidism happened. I don't know where my Brock String is now, but I do still have the 3D glasses and targets and I get them out to do those exercises. I have also found playing games on the Nintendo 3DS XL to help too. Making that glasses-free 3D image stay steady is good exercise too. I had forgotten about this string exercise. I'll need to make or buy a new one and give it a try again.

[@nv_chino]

Hope you’re free of pain

[@ghihbgyu]

I have this, and I have no idea to make progress with this brock string. I can only get my eyes to look at the same point right in front of my nose and nowhere else. Could you give some advice? Like visualisations or what muscles to focus on, anything that helped you make it work.

[@enfieldjohn101]

It takes a lot of practice and patience. What I do is try to block out all other thoughts and focus on just the exercise. The rectus muscles around your eyes do most of the work of controlling your eyes as I understand it. The two main ones you are exercising here are the medial and lateral rectus. The medial recuts pulls your eye toward your nose and the lateral rectus pulls your eye away from your nose. My medial rectus muscles are my weakest ones, especially on my left eye. I can sometimes really feel them straining when I try to concentrate on keeping something single. When I get headaches from concentrating on reading or working on small things, I feel the pain the worst between my eyes and on both sides of my nose. I therefore find it easier to keep things from going double, or to make double things become single when they are farther away from me. It might be that your lateral rectus muscles are the weak ones in your case. Or, that the nerves controlling your lateral rectus muscles are the ones having the most trouble sending signals. Sometimes, double vision is caused by muscle weakness, sometimes by nerve problems and sometimes by a combination of the two. It may be that I have both the weak muscle issue and nerve problems for my medial muscles since my double vision is getting worse now that I have hyperparathyroidism. One of the symptoms of hyperparathyroidism is nerve pain and problems with controlling them, especially my weakest ones. I start with beads towards the far end of the string and think hard about making each one of them the center of my attention. I imagine that it is not on a string and that it is flying toward me, so I need to focus on it in order to catch it. I try to think of that level of focus. I think to myself "I need to be able to reach out and grab that bead". That helps me motivate myself to work at it. I got hit in the face by baseballs, basketballs, etc. a lot as a little kid. Had to replace glasses at least once a year. Sometimes, I had to settle for taping and gluing them back together until my parents could take me to the eye doctor and later until the replacement glasses came in. So, thinking about that helps motivate me to concentrate when doing this exercise. I also sometimes think about the things I want to be able to do that require good vision. I enjoy reading, archery, computer repair, playing video games and tabletop games, gardening and painting models and miniatures. My wife usually drives, but now and then, I need to because her right foot or knee hurts too much. I can't do any of those things when I'm seeing double, so I have to tell myself that I need to do well on these exercises so that I can participate in those activities better. When my eyes are too tired to do the exercises for a while, or to do any of those activities, I enjoy other things like listening to books on CD or tape, singing and listening to music. I can do those things with my eyes closed even, if I need to. It took me three years of doing these exercises, Brock String, 3D glasses, etc. every day before I got to where I could control my double vision by concentrating on specific things. I was born with double vision and my family didn't find a specialist who figured out that I had it until I was four years old. Probably because my eyes weren't obviously 'wrong'. I didn't have crossed eyes and my eyes didn't wander drastically enough for it to be obvious. Just enough to keep me from being able to focus. I couldn't cross my eyes when I was a baby and I still can't. I can purposefully look at the left and then the right (or vice versa) of my nose with effort, but not both sides of my nose at the same time. Can't roll my eyes either. I can make them go up, left, right, down, etc. but not fast enough for it to be considered 'rolling your eyes'. Makes the muscles in my face hurt to even try it even today and I'm in my upper 40's now. Be patient with yourself and allow yourself time to master these exercises. It's not easy. I tell people who ask about them when they see the exercise equipment in my house that doing these eye exercises is a bit like doing physical therapy for an injured arm or leg. Most people have had PT for an injury like that, or know someone who has, so that helps them understand better. I remind myself of that sometimes when I get frustrated that my double vision is getting worse now. I tell myself things like "It took two years of PT to recover from your injured shoulder after that car accident and your shoulder is still sore most of the time, so don't expect to get your eyes working better instantly either". I hope this helps. I hope that you keep at it and experience improvement. It's so gratifying and kind of exciting when one works hard at something for a long time, then finally sees results. I'll never forget the first time that I was able to see a page of text correctly so that I could read it when I was eight years old. It was so exciting to finally be able to read for myself! I've been a bookworm ever since, but I can't read for more than a couple of hours at a time without an eye break. That's the biggest thing: thinking of what you want to be able to do with clear, non-double vision and use that to motivate you. @@ghihbgyu

[@ghihbgyu]

@@enfieldjohn101 Thank you for replying :-) I have very obvious convergent strabismus and my motivation is mainly cosmetic. I was very self conscious about it when I was younger and still feel that it's the ugliest thing about my body. I did a simple eye exercise to test my eye muscles, and it turns out that the muscle of my 'turning' eye is indeed quite weak. I'll start by doing strengthening exercises every day. I also noticed that I'm able to make myself even more cross-eyed if I move my finger even closer to my nose. Somehow I never knew that, because I've always just relaxed my eye muscles rather than making any effort to make them work together (I never saw any point in making myself even more cross-eyed :P). If I can just somehow start there and then maybe get them to also work together as I move the finger away....

[@ghihbgyu]

By the way, how long are your training sessions per day?

[@DaLeSy.]

Is this the eye exercise I need to fix a lazy eye (nearsighted in one and far sighted in the other)?

[@brandysharpe5642]

Great video! Would this exercise be useful for divergence excess?

[@MrDdm343]

yes, your eyes seem to diverge/relax to much in the distance. So this can definitely help you.

[@zarakhan6913]

Hi doc . Can you please tell me how many times a day do this exercise

[@shellschoonover9579]

How do you recommend programing? Start at level one and when proficient go to next level? Or should all 3 levels be practiced in a session ?

[@penn4920]

My Optometrist told me I have to do this, because I was slightly positive for BVD. I was wondering how long it takes to see results?

[@mrbadiuzzaman]

I am a 64 yr old highly myopic who's been suffering from diplopia due to ocular myasthenia gravis the last 20yrs. For that my vision was partly corrected with a 5 prism on the left eye & a yr ago I had vitrectomy for retinal detachment on the right eye which not only aggravated the diplopia but the image to intersect at the top. How could vision therapy be useful?

[@christalau5314]

What is the best frequency and time consuming to do the training?

[@LionhartM]

Very helpful and good work on the video, but I can't help but comment on you saying you're standing two feet away from the board - it's more like 3 to 3.5 lol

[@YL-nx3yk]

Thank you so much! This video really helps a lot. I will have double vision when I work in front of my computer for a long time. I currently wear prism lenses with 6 degrees for each side. My question is: should I wear the prism glasses when I do brock string exercise, or not?

[@engineerpro4502]

bence takmamalısın. hastalığınla ilgili bir gelişme var mı dostum?

[@canbull97]

Thanks for this video which is help me a lot, I'm a senior have been had a problem with vertical diplopia for two months. I found your video on New year day, then following your video I did exercise only for 3 days, my problem has been gone 90%. Thank you very much. I will do more this exercise and hope for fully recovery, if you could introduce more exercise I would appreciate.

[@Insightvisionoc]

Glad it helped!

[@yudhirsingh7214]

I also have these types of prblms

[@christianlindsay1042]

Great

[@christianlindsay1042]

I think I'm going to get the Brock string it appears to be very helpful

[@danielho2452]

May I know, how close it should be between the bead and the nose, at the Level 1 step 10?

[@samcookiebox]

Man, this has made me realise just how scary bad my eyes are. It's two beads beyond 10cm from my face, and I can't get the bead in focus anywhere, the strings aren't crossing at the right place, and one string is very faint. AND I am wearing my new prism lenses with a prescription for near vision. Close one eye, either eye, and I can get focus on the bead fine. Also, 0 to headache in 5 seconds.

[@Kyoutube121]

Hello thanks for the video. I only see X when the bead is really close to my nose. a little far, X distorts. So how do i make improvements so that X continues as beads go more far? just keep practicing looking at the X when its close? and slowly it will improve little by little?

[@coolguy79jeffrey]

would it be good to train my good eye? my bad eye had been diagnosed with ischemic CRVO...

[@Ayesha32310]

Can i do this exercise for hypertropia??

[@aleksandrasiemaszko6757]

How often patient should do exercises at home and how often? when do you take follow-up check.

[@siggeboda]

Hello and thanks for this video! A question: should the brock string allways come with 3 "pearls" or can it be more of them, like 5? And if so, what is the difference in training?

[@MrDdm343]

Does the string always have to be right in front of you, or can you also use it in an up/downward gaze?

[@TAMAPRATAMA24908]

hi doctor lam ,,, can exercises like this cure double vision and squint due to eye stroke ??? Please reply

[@gsarmiento28]

Hello how often should i do this exercises to correct my lazy eye ? Hope you read this I'm waiting for your answer .. 🙏

[@Ricky-eg3wd]

Hello Dr. Does it work for hyperopia?

[@poogadaddy7298]

I didn't hear a recommended age for these exercises. Is there one?

[@Xebec9894]

Can smartphone be cause double vision or physical injury on head area ?

[@wbmstr24]

amazon has a ton of brock string choices , which should i choose?

[@princegoyal9078]

Will this help to treat doublr vision

[@tama8650]

Can I ask if this exercise is suitable for esotropia?

[@debabr4t.x]

Hello i wanted to know if brock string helps with the strabismus in which one eye drifts outward when viewing objects that are far away. My doctor recommended me brock string

[@baldeagle8597]

Is there an upper limit, as to how much time i can do it in a day??

[@pooja-sd9zy]

Hello ma'am I want to ask a question to you that when we do eye vison threapy then it important to see double ya single ? 👀i have outward eye and I can see single one thing what should I do

[@meditationmusic-wk4ph]

Plss mam can u give me some suggetion related to embliopic eye plssssss

[@leannel6240]

I have double vision when looking far. Could the Brock string help with that? And how would it be different to do the Brock string with my condition?

[@ashispradhan5730]

Can esotropic patient perform Brock string.as my right eye is turned inward?

[@danielho2452]

I wonder if this exercise can be used with children with ASD and non-verbal ? Since they may not able to give correct feedback on what they see

[@gauravsinghadhikari9602]

How can i focus with both eye as in my left eye is amblyopia and i can't focus with it while my right eye is open please help Me out

[@spiderlashful]

Hi Dr, I had strabismus surgery 1.5 mos. ago for esotrpia. For 2 weeks my eyes looked aligned and then my left eye which was the least pulled became drifting out as exotropia. It has been like that for 2.5 weeks. What happened? I've been hearing about vision therapy. Is that eye muscle stretches? Can that work for me? How about pencil push-ups? Can this Brocks string exercises video work for my current condition, too? Please help me know. I am worried. Thank you!

[@ThePclayton]

Will this work if one’s double vision is caused by Graves’ disease?

[@humamoloo8650]

hi, i have a lazy eye , when i take the green bead far, i cant see it crossing however much i try, however, i can see the cross when i bring the bead closer to my eye. should i continue with the bead closer to my eye then take it dar slowly? is that correct?

[@marinakarim2187]

I am 55 years old and have a lazy eye, which has very little vision left. In fact, I can see from only half portion of the eye. Will this therapy help me?

[@teresaandkerrywhocares539]

I just got my prism lenses; to do this exercise, do I need to have glasses ON or OFF?

[@Alex-oe6ww]

I have recently been prescribed prism glasses and am interested in trying therapy like this to improve my binocular vision. I have minor hypertropia. I have tried this and often see two strings and two beads that meet but are not perfectly aligned, one side lower than the other. Will this exercise help train my eyes?

[@JustBlinkIt]

very hard to train up and down movements compared to convergence and divergence awareness like they are doing in this video

[@Ismimical]

Is this exercise helpful in convergence insufficiency?

[@bethloppnow1583]

Does this work for a patient with one eye that has very low vision?

[@valerieracicot244]

So no matter what I do I cannot ever see 2 strings. It switched back and forth which eye I am using and I will always see on the left or the right but never together.

[@lyndagabriel6539]

While I really appreciate the video (thanks!) it is frustrating that I can't get the emergent brock string (or other products) because I'm a patient, not part of a clinic. I'm a very proactive, motivated person with early stage AMD, and I'd love to be able to access all the vision tools! Back to the amazon offerings, which sound too stretchy for a start...

[@zacharysherry2910]

That's funny this incremental exercise is called the "caterpillar" when you do it in a pushup position and move your hands incrementally, then i saw a ladybug 🐞 for the eyes version lol. Baby steps are universal.

[@jamilah9782]

My right eye : Sph -05.75, Cyl -03.50 Left : Sph -03.00, Cyl -1.50, I've been diagnosed amblyopia, I'm 28 y.o, Indonesian. Is it good if I do the exercise with glasses?

[@DownhillAllTheWay]

This is a very minor niggle that doesn't really make any difference to what you are doing, but if you ask her to hold for 5 seconds, and you count them 1..2..3..4..5, you have only held it for 4 seconds - (1..2), (2..3), (3..4), (4..5). If you counted from zero, then (0..1) would be the first second. Time periods always start from zero. This is more important if you are estimating the length of an event that lasts less than 10 seconds. My seconds are always crockodiles. I count 0 crockodile 1 crockodile 2 crockodile 3 etc.

[@SusanJohnston]

How can I get a Brock string please?

[@Adventurer1990]

I am doing this exercise to learn shooting with both eyes open, can this exercise still help me as a 30 year old adult?

[@imranullahkhan5454]

I am 18 and my lazy eye sight is 6/12 is this exercise help me

[@inactive3287]

I've always tried these exercise but my left eye can never go inwards.what am I supposed to do

[@innovatecoin9990]

Why is this only available to doctors? Wish I could buy your version rather than generic Amazon ones :\

[@rss1761]

Are these exercises,and vision therapy in general,going to lower the exodrift deviation (PD) for IXT over time as well ,or only improove fusion/control/frequency of deviation?

[@Haburg]

they will improve* if done regularly for 6-12 months

[@rss1761]

@@Haburg thanks

[@RobAgrees]

Would you be able to do a video on divergence insufficiency exercises?

[@Insightvisionoc]

Dr. Lam is very busy, but I will add that to the list of new content ideas. Definitely a video we want to create for 2022!

[@daeborsusngi4572]

Can it be done while wearing glasses?

[@syedamadihashahid2163]

Do we have to wear our glasses while performing this exercise or not?

[@anita2019]

How many times should do in a day

[@madisonzeise9802]

Will this help with convergence insufficiency? One of my eyes drifts slightly outward sometimes, depending on which eye is focusing... I'd like to help them work together please! ❤ thank you!

[@episode40]

Yes mine does this and my doctor told me to do an exercise similar to this but I've been told to draw a red dot on a piece of paper and tape it on a wall eye level height and to get a pencil and point it at the red dot and focus on the pencil as i slowly bring it closer to my nose (u are supposed to see two red dots when u focus on pencil) and after 5 times of doing that the 6th time u focus on the red dot but u slowly bring the pencil closer to ur nose and now ur supposed to see two pencils

[@Worm20Deezy]

Mine does the same. I hope this works for me.

[@Hammadali-cu2zr]

Can I watch all your lazy eyes video to cure my AMBLYOPIA I am 18-19 yrs old with 6/6 on left and AMBLYOPIc right with 6/9 ?

[@patrickcooper1122]

Hi, I also have a lazy eye. Can you please tell me if you sell or where I can get a medical grade brock string for at home exercises please. Thank you!

[@veryveryvonfused]

amazon sell them