JJ Van Zyl Optometrists

JJ Van Zyl Optometrists Our Mission is to IMPROVE your Vision http://www.johanvanzyl.com Our Mission is to IMPROVE your Vision . How do we do that ? By spending time with our patient's.

We all know that when you love something or someone - you spend TIME with them. With our 1 hour consultations we have TIME to listen to you. This says it all. Van Zyl Oogkundiges bied kwaliteit, bekostigbare oogsorg, en ons sal U verbaas met ons GOEIE pryse , maar VERBYSTER met ons kwalitiet oogsorg

Ek het onlangs 'n Video gemaak, oor HOE om gewoond te raak aan jou nuwe Multifokale lense! As jy dalk sukkel, met jou Mu...
01/11/2025

Ek het onlangs 'n Video gemaak, oor HOE om gewoond te raak aan jou nuwe Multifokale lense! As jy dalk sukkel, met jou Multifokale brille, kyk gerus hier!

When someone gets new multifocal or progressive lenses, it’s common to feel off-balance or experience eyestrain, especially during the first week or two.
AND , especially as you grow older or if you have astigmatism or you need any prisms .The brain and visual system need time to adapt to the new way images are distributed through different lens zones.
I always tell my patients, that you have become good at seeing bad, and now we have to teach you to become good at seeing good!

Although the main adjustment happens naturally, there is ONE eye–brain coordination exercises that can make the adaptation period easier and faster.

🌟 1. Head and Eye Coordination Practice

Goal:
Train your eyes to move naturally through the different zones of the lens.
Exercise:
• Hold a book or phone at normal reading distance.
• Instead of just moving your HEAD, tilt your eyes slightly downward to read through the lower part of the lenses.
• Then look up to a distant object (4-6 m away) by lifting your EYES slightly - TRY to keep your head as motionless as possible
• Repeat this back-and-forth eye movement and focus shift for 2–3 minutes, two or three times a day.

👉 This teaches your brain which part of the lens gives the clearest vision for each task.

👀 2. Tracking and Focusing Exercise

Goal: Improve smooth eye movement across the progressive corridor.
Exercise:
• Stick a small target (e.g. a letter or sticker) on a wall about 4-6 m away.
• Hold another similar target at reading distance.
• Look back and forth between the near and far targets, keeping your head still - ONLY move your eyes up and down and then - your head if necessary to bring targets into focus

⏱ Do this for 1–2 minutes a few times daily.



📘 3. Reading Line Training

Goal: Reduce distortion and “swim” sensation when reading.
Exercise:
• Use a magazine or newspaper.
• AGAIN - lower your eyes - first (not just your head), bring the first couple of words you want to see into focus and then slowly follow the line of words - slightly side to side
• Practice for 2-5 minutes.

💡 This trains smooth eye-head–coordination and stabilizes peripheral perception.
ALWAYS remember, the better and the quicker you teach your eyes way to look accurately in your new progressive or multifocal lenses, the bigger the visual field becomes and the less distortion on the sides you have!

🧠 4. Peripheral Awareness Exercise

Goal: Adapt to edge distortion or “swim.”
ONLY, do this exercise once you feel comfortable with looking straight up and down!
Exercise:
• Look straight ahead, then slowly move your head side to side, observing how the edges of your vision change.
• Try to keep your gaze relaxed and centered.
• Avoid large or jerky head turns — smooth, slow movements help your brain recalibrate spatial awareness.

🕐 Adaptation Tips
• ALWAYS, wear your new progressive or multifocal lenses in an environment that you feel comfortable with for example at home.
THEN, Wear your new progressive or multifocal lenses on a level flat surface - maybe outside - where you feel comfortable and relaxed.
ONLY, then, try full-time wear for 5–7 days (don’t switch back to your old pair).
• Ensure correct frame fit and pantoscopic tilt — even a few degrees off can make adaptation difficult.
• If dizziness or eyestrain persists after 2 weeks, contact your optometrist, as they should check your Prescription, lens centration, corridor length, and incorrect segment height..











When someone gets new multifocal or progressive lenses, it’s common to feel off-balance or experience eyestrain, especially during the first week or two. AND...

I recently, uploaded a Video on Convergence Insufficiency. WHAT is Convergence Insufficiency? Convergence Insufficiency:...
01/11/2025

I recently, uploaded a Video on Convergence Insufficiency.
WHAT is Convergence Insufficiency?

Convergence Insufficiency:
Clinical cases in the practice :.
Testing and Treatment Approaches

Keywords: Convergence insufficiency, binocular vision, vergence dysfunction, vision therapy, near point of convergence, fusional vergence

Convergence Insufficiency (CI) is a common binocular vision disorder characterized by a reduced ability to sustain adequate convergence during near tasks.
Symptoms often include eyestrain, headaches, blurred or double vision, and difficulty with reading or near work.
This Video review shows clinical cases , diagnostic criteria, and evidence-based treatment options for CI, emphasizing home-based vision therapy approaches.

1. Introduction

Convergence insufficiency (CI) is a non-strabismic binocular vision disorder marked by an exophoric deviation greater at near than at distance, accompanied by reduced positive fusional vergence (PFV) and a receded near point of convergence (NPC).
It affects approximately 2–8% of the population, with higher prevalence in children and young adults who perform extensive near work

Despite its frequency, CI is often misdiagnosed or overlooked, leading to chronic visual discomfort, reduced reading efficiency, and impaired academic or occupational performance.

2. Pathophysiology

Convergence insufficiency is typically functional rather than structural, arising from inadequate neuromuscular control of convergence relative to accommodative demands.
In a normal vergence–accommodation system, convergence and accommodation are linked via AC/A (accommodative convergence/accommodation) and CA/C (convergence accommodation/convergence) relationships.

In CI, these relationships remain intact, but the positive fusional vergence amplitudes are insufficient to maintain alignment at near, particularly under sustained demand. Secondary causes may include:
• Traumatic brain injury or concussion
• Parkinson’s disease
• Post-viral fatigue or systemic illness
• Medications affecting oculomotor control

3. Clinical Presentation

3.1 Common Symptoms
• Eyestrain and headaches during near tasks
• Blurred or double vision (intermittent diplopia)
• Difficulty concentrating or maintaining place while reading
• Words moving or jumping on the page
• Reduced reading comprehension
• Chronic tiredness or avoidance of near work

Symptom questionnaires such as the Convergence Insufficiency Symptom Survey (CISS) provide quantitative assessment of symptom severity

4. Diagnostic Testing for Convergence Insufficiency

Diagnosis requires a battery of tests assessing vergence, accommodation, and oculomotor function. The following are key clinical measures:

4.1 Near Point of Convergence (NPC)
• Procedure: A fixation target (e.g., accommodative target or penlight) is moved slowly toward the patient’s nose.

4.2 Cover Test
• Procedure: Alternating cover test at distance and near.

4.3 Vergence Ranges (PFV and NFV)
• Procedure: Measured with prism bars or a phoropter

4.4 AC/A Ratio
• Typically low

4.5 Stereopsis and Vergence Facility
• Reduced stereopsis and slow vergence facility

6. Treatment Approaches

6.1 Optical Correction
• Refractive correction (especially for hyperopia or uncorrected astigmatism) is essential before initiating therapy.

• Prisms (base-in) can provide temporary relief but do not address the underlying vergence dysfunction.

6.2 Vision Therapy

6.2.1 Home-Based Exercises
1. Do the Clock , The Cross , The Sky-Nose, and Burpee Looking.

• Always start slowly, once or twice a day for 3-4 minutes , basically, 1-2 sessions daily.

2. Brock String
• After doing the above Eye exercises, start on the most important eye exercise - The Brock String. There is a totally separate video I made on the Brock string exercise with my own ( JJ van Zyl) version

7. Prognosis and Follow-Up
• Most patients with primary CI experience significant improvement within 12–16 weeks of structured therapy.

8. Conclusion

Convergence Insufficiency is a treatable binocular vision disorder with profound effects on comfort and near vision.











Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

Welcome to  .  Let us know in the comments what you see.
01/11/2025

Welcome to . Let us know in the comments what you see.

Why have a Black Friday when you can have a Black November?  ,  ,
01/11/2025

Why have a Black Friday when you can have a Black November? , ,

01/11/2025
SIEN jy REG, of SIEN jy skeef..., OF, bedrieg jou oë jou...😳 😂 Kyk na HIÉRDIE foto, en, laat weet my, wat jy d**k...?
31/10/2025

SIEN jy REG, of SIEN jy skeef..., OF, bedrieg jou oë jou...😳 😂
Kyk na HIÉRDIE foto, en, laat weet my, wat jy d**k...?

Last week, I had to go to the Dermatologist - For my routine yearly examination. Living, in a sunny country is fantastic...
30/10/2025

Last week, I had to go to the Dermatologist - For my routine yearly examination.
Living, in a sunny country is fantastic, but this is one of the risks that you might have as you grow older..SKIN damage...😳 😩
Unfortunately, the Dermatologist discovered some precancerous areas on my face and he really went to work on me....😳 
It was for this reason , why I did not upload any videos in the last two weeks. ( I was looking a little bit like Frankenstein monster..😂😳 )
IF , you are over 60 and you live in a sunny area I would strongly advise you to consider going for a routine skin inspection ( Mole patrol) at a dermatologist.
RIGHT - WITH , that now over we decided to clear my diary for most of the day - today , and today we will be making three videos.
I’m making these videos simply because this is some of the recent cases I saw in the Practice!
The first video is basically regarding convergence insufficiency and how do we treat it. People , often think convergence insufficiency can only happen to older people but this is something not the truth. It can often go undetected in children and cause severe learning problems !
The second YouTube video I will be making is regarding prisms - what is prisms and how do we use it in BVD( binocular vision dysfunction)
Again I’m making this video because it adds onto the convergence insufficiency YouTube video , and , simply because we often use prisms in convergence insufficiency and range of visual therapy.
The last video I’m making today will be about , HOW , to adapt to your new Vari or multifocals.
AGAIN , this is a common problem we encounter in the Practice and there is ONE basic eye exercise that NEW wearers of multifocals should be doing for at least two weeks when they receive their new multifocals !
WATCH out for these new videos , but , in the meantime , you’re welcome to have a look at my eye exercises Video or why you are struggling with your current multifocals …

https://youtu.be/WJjWnMiimIw?si=Fw9dT68JBp7T6f7Q





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WOWW 🤩 - Brilliant work!

Is the the most common type of surgery that is done today on the planet today, and it is also a surgery that can be life changing for patients who might be, just about blind, due to their cataracts.
WELL done to the team! 🤩💪

Hiérdie, is 'n baie interessante Video oor Sonblok - Maar, WAT van jou oë? Het jy al ged**k, hoe die son, jóú oë en Reti...
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Hiérdie, is 'n baie interessante Video oor Sonblok - Maar, WAT van jou oë?
Het jy al ged**k, hoe die son, jóú oë en Retina kan beskadig...?
Om jou oë, te beskerm, skakel gerus JJ van Zyl Oogkundiges!

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Now that the weather is getting warmer and our cheeks are getting redder, it’s important to know that our eyes also get affected by the sun and can get sunburned. It’s important to take care of our eyes by protecting them with UV-blocking sunglasses. Your eyes want a little “SPF” too! ☀️🌅🕶️

This is great news for all age related macular degeneration patients ! Is this news clip from the BBC re. A News story a...
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This is great news for all age related macular degeneration patients !
Is this news clip from the BBC re. A News story about a chip implanted behind a the patients retina , that partially restores vision.
ALSO , remember if you have AMD to ensure that you take your nightly melatonin supplements! 



A group of blind patients can now read again after being fitted with a life-changing implant at the back of the eye. A surgeon who inserted the microchips in...

This week is Inflammatory Eye Disease (IED) Week, as declared by Prevent Blindness!If you have arthritis, you are at a h...
21/10/2025

This week is Inflammatory Eye Disease (IED) Week, as declared by Prevent Blindness!

If you have arthritis, you are at a higher risk for developing eye problems, including inflammatory eye disease.
ALWAYS, keep track of the medications that you use and their side-effects !

Put together a treatment plan with your doctor to keep your arthritis under control.

For more information, visit: PreventBlindness.org/inflammatory-eye-disease



Address

Building 3, The Golf Village Somerset West (Next To Sanctuary Mall), 8 De Beers Avenue
Somerset West
7130

Opening Hours

Monday 09:00 - 17:00
Tuesday 09:00 - 17:00
Wednesday 09:00 - 17:00
Thursday 09:00 - 17:00
Friday 09:00 - 17:00

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