Dr. Johan Zwaan

Pediatric Ophthalmology
TX
60 years experience

About

Specialties
Doctors may have more than one area of specialty interest. Board certification in a specialty area means the doctor has completed formal training and has practice experience in that specialty, and has passed the certification examination from the corresponding accredited medical specialty board.

Pediatric Ophthalmology

Languages spoken

English

Doctor Q&A

61 Answers
1 Agree
The number of answers this doctor has agreed with.
A 27-year-old female asked:
Dr. Johan Zwaan
60 years experience
Usually not treated: I assume, that you mean "floaters". Generally, people get used to them and no treatment is recommended or necessary. In rare circumstances a vitrectom... Read More
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A 48-year-old member asked:
Dr. Johan Zwaan
60 years experience
Any: There are many lubricating drops. A gel type would work best for a pterygium. However, the eye will be red at times, as long as the pterygium is there... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 34-year-old member asked:
Dr. Johan Zwaan
60 years experience
Only in childhood: It depends on what is meant with "lazy eye". In adults reduced vision due to amblyopia unfortunately can not be "fixed". This can only be done in earl... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 38-year-old member asked:
Dr. Johan Zwaan
60 years experience
Can be several thing: The pimple is probably not right on your lash, but next to it. It may be a small inclusion cyst or even a wart. It needs to be seen.
Created for people with ongoing healthcare needs but benefits everyone.
A 46-year-old male asked:
Dr. Johan Zwaan
60 years experience
Unlikely connection: Usually strabismus does not cause eye pain, with a few exceptions. If there is a hypotropia when moving the eye nasally, you may have a brown syndrome... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 39-year-old member asked:
Dr. Johan Zwaan
60 years experience
No: Getting hit in the testicles does not cause esotropia (crossed eyes).
Created for people with ongoing healthcare needs but benefits everyone.
A 46-year-old female asked:
Dr. Johan Zwaan
60 years experience
Maybe: Vitiligo is a loss of pigment from the skin, hair, and /or eyelashes. As long as it is restricted to those, the vision is not affected. Sometimes it i... Read More
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A 28-year-old male asked:
Dr. Johan Zwaan
60 years experience
I don't know: Without knowing more, it is impossible to answer the question. You need an eye exam and maybe a neurological one.
Created for people with ongoing healthcare needs but benefits everyone.
A 31-year-old member asked:
Dr. Johan Zwaan
60 years experience
None: Contact lenses do not have refractive errors, but the eye may. Contact lenses come in different powers to compensate for the refractive error of the ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 24-year-old male asked:
Dr. Johan Zwaan
60 years experience
No health concerns: Twitching of the eye lids is very rarely of concern. Rarely some syndromes such as la tourette can start with eyelid twitching and grimacing. Most of... Read More
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A 46-year-old member asked:
Dr. Johan Zwaan
60 years experience
Yes: A child with a lazy eye (amblyopia) often needs patching of the good eye, after any refractive error is taken care of with glasses.
Created for people with ongoing healthcare needs but benefits everyone.
A 22-year-old female asked:
Dr. Johan Zwaan
60 years experience
No: There is no evidence that any oil makes the eyelashes grow. The only substance that does, is a glaucoma medicine, now also available as cosmetic.
Created for people with ongoing healthcare needs but benefits everyone.
A male asked:
Dr. Johan Zwaan
60 years experience
None: There is some evidence that doing a lot of close up work might increase myopia. However, genetic factors do play a role.
Created for people with ongoing healthcare needs but benefits everyone.
A 26-year-old male asked:
Dr. Johan Zwaan
60 years experience
Depends on the type: Strabismus surgery can be done on one or both eyes, depending on the type. Recovery time depends on the type of surgery. Usually the conjunctiva heals... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 31-year-old female asked:
Dr. Johan Zwaan
60 years experience
It varies: Red spots on a baby's skin can be caused by a variety of agents, from irritation due to a diaper rash to a viral infection. For a proper diagnosis the... Read More
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A 19-year-old female asked:
Dr. Johan Zwaan
60 years experience
Neither: A stye is an infection, usually of the roots of the eye lashes. Bleeding may occur if it "pops". You should have it seen and obtain ocular antibiotic ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 49-year-old member asked:
Dr. Johan Zwaan
60 years experience
Yes: Retinal detachments can occur at a young age, but are rare. Risk factors are trauma, high myopia (nearsightedness), some peripheral retina degeneratio... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 33-year-old male asked:
Dr. Johan Zwaan
60 years experience
No: If it is an optic nerve, it can not be repaired.
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A 19-year-old female asked:
Dr. Johan Zwaan
60 years experience
Any tear substitute: There are a great many drops for dry eye. For longterm use i recommend preservative-free ones to avoid allergic reactions. Restasis is dilute cyclospo... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A member asked:
Dr. Johan Zwaan
60 years experience
Misalignment of eyes: Any misalignment of the eyes constitutes strabismus, whether it is crossed eyes, wall eyes, or vertical. Occasionally it is caused by poor vision in a... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 48-year-old member asked:
Dr. Johan Zwaan
60 years experience
Retina disease: Retinitis pigmentosa is a degenerative disease of the retina. In most cases it starts in the periphery and constricts the visual field until only a sm... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 19-year-old female asked:
Dr. Johan Zwaan
60 years experience
More info needed: A blocked tearduct does not cause a cyst on the eye. If you mean a cyst of an eyelid gland, a chalazion, warm compresses, "lid scrubs" with baby shamp... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 20-year-old male asked:
Dr. Johan Zwaan
60 years experience
A normal diet: A healthy diet is usually fine. If you want to be more than 100% sure, eat some carrots and use omega -3 fatty acids 1-2 times/day.
Created for people with ongoing healthcare needs but benefits everyone.
A 51-year-old female asked:
Dr. Johan Zwaan
60 years experience
Many things: It can be many things, from a sebaceous cyst, to molluscum contagiosum, to a tumor. You need to see an ophthalmologist to have it checked.
Created for people with ongoing healthcare needs but benefits everyone.
A 43-year-old member asked:
Dr. Johan Zwaan
60 years experience
Laser surgery: You can only "improve" a refractive error by laser surgery. You can "compensate" for it by wearing the correct glasses or contact lenses, but the ref... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 22-year-old member asked:
Dr. Johan Zwaan
60 years experience
No: Latisse (bimatoprost) is a prostaglandin analog originally used for glaucoma. At this time I am not aware of any other products on the market.
Created for people with ongoing healthcare needs but benefits everyone.
A 45-year-old member asked:
Dr. Johan Zwaan
60 years experience
No: This itch will not make you blind. It may indicate that you have a skin condition. Have it checked.
Created for people with ongoing healthcare needs but benefits everyone.
A 35-year-old member asked:
Dr. Johan Zwaan
60 years experience
No affect: Allergies may cause loss of lashes, usually by rubbing of the eyes due to itch. The follicles generally are not affected and the lashes can grow back.
Created for people with ongoing healthcare needs but benefits everyone.
A member asked:
Dr. Johan Zwaan
60 years experience
Yes: Variable drooping of an eyelid may be caused by myasthenia gravis. It may also be congenital and vary with time of the day, tiredness. You should hav... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 36-year-old member asked:
Dr. Johan Zwaan
60 years experience
By more surgery: Pterygia grow on the eye, usually on the nasal side. They can be removed, but often come back. Sometimes it helps to replace the removed tissue with a... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 39-year-old member asked:
Dr. Johan Zwaan
60 years experience
Counseling: You may be disappointed in the surgical result. Adults often have unrealistic expectations about what strabismus surgery will do for them. Sometimes c... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 35-year-old member asked:
Dr. Johan Zwaan
60 years experience
No: Lazy eye may lead to reduced vision in one eye, but it does not cause complete blindness.
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old female asked:
Dr. Johan Zwaan
60 years experience
Yes: The hpv vaccines are less than 100%but the chace of getting it is reduced. Effective, so it is possible to contract the disease even after vaccination... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 46-year-old member asked:
Dr. Johan Zwaan
60 years experience
No: It appears that you are getting presbyopia. Obtain a pair of reading glasses.
Created for people with ongoing healthcare needs but benefits everyone.
A 48-year-old member asked:
Dr. Johan Zwaan
60 years experience
Don't worry: This usually is a form of blepharitis. Use warm compresses as much as is practical. "scrub" your eyelids/lashes with baby shampoo and , of course, the... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 35-year-old member asked:
Dr. Johan Zwaan
60 years experience
No: If you can roll your eye up voluntarily, it is not strabismus.
Created for people with ongoing healthcare needs but benefits everyone.
A 45-year-old member asked:
Dr. Johan Zwaan
60 years experience
It does not: The brain has no "blind spots", the eye does. The place in the retina, where the optic nerve leaves the eye on its way to the brain, does not have ph... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 31-year-old female asked:
Dr. Johan Zwaan
60 years experience
More surgery: Depending on the size of the esotropia he may need more surgery. Unfortunately strabismus surgery is not always 100 % successful.
Created for people with ongoing healthcare needs but benefits everyone.
A 49-year-old member asked:
Dr. Johan Zwaan
60 years experience
None: There really are no good eye exercises for strabismus, except for convergence insufficiency.
Created for people with ongoing healthcare needs but benefits everyone.
A 49-year-old member asked:
Dr. Johan Zwaan
60 years experience
Crossing one type: Strabismus is a term that applies to any type of deviation of the normal eye position. Crossing eyes is only one type of strabismus (although there ca... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 33-year-old female asked:
Dr. Johan Zwaan
60 years experience
Lose by dieting: Unless you have an extremely accurate scale (and most bathroom scales are not) the difference is not significant. Weight gain in pregnancy, if you dis... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 39-year-old member asked:
Dr. Johan Zwaan
60 years experience
Only in childhood: It depends on what is meant with "lazy eye". In adults reduced vision due to amblyopia unfortunately can not be "fixed". This can only be done in earl... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 24-year-old male asked:
Dr. Johan Zwaan
60 years experience
I don't know: Many things can cause a red and swollen eye; some can lead to vision loss. Go see an eye doctor.
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old male asked:
Dr. Johan Zwaan
60 years experience
Probably: The redness and pain is probably the results of the injury or infection that made the bandage lens necessary in the first place.
Created for people with ongoing healthcare needs but benefits everyone.
A 38-year-old female asked:
Dr. Johan Zwaan
60 years experience
He is goofy: Eyes rolling around like you describe is almost always due to goofing around, as long as it seems voluntary. If the child cannot keep the eyes straigh... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 85-year-old female asked:
Dr. Johan Zwaan
60 years experience
No connection: I have never heard of fibromyalgia causing a squint.
Created for people with ongoing healthcare needs but benefits everyone.
A 51-year-old female asked:
Dr. Johan Zwaan
60 years experience
Some possibilities: There are several possible reasons for eye lash loss. When we age lashes often grow shorter or fall out. Excessive rubbing or even pulling the lashes ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old male asked:
Dr. Johan Zwaan
60 years experience
Sigle lenses are OK: You list three non related problems. Exotropia usually requires surgery; toric lenses are for astigmatism, of which you have a negligible amount; at a... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 38-year-old member asked:
Dr. Johan Zwaan
60 years experience
Only if uncorrected: Refractive errors mean that you have trouble focusing on what you are interested in. Once the error is corrected with glasses, contact lenses or laser... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 32-year-old member asked:
Dr. Johan Zwaan
60 years experience
No affect: Allergies may cause loss of lashes, usually by rubbing of the eyes due to itch. The follicles generally are not affected and the lashes can grow back.
Created for people with ongoing healthcare needs but benefits everyone.

Testimonials
Recommendations and Thank you notes are endorsements given from patients or other doctors.

3
Recommendations
85
Thank you notes
Jan 5, 2014
Need more people like you on Health Tap! Thank you for your contribution! Excellent!
HealthTap member
Mar 30, 2015
Dr. Zwaan is an amazing doctor! #nationaldoctorsday2015 #virtualflower1
HealthTap member
Mar 31, 2015
Dr. Zwaan is an amazing doctor! #nationaldoctorsday2015 #virtualflower1
HealthTap member
Thank you, your answer was very helpful! Thanks for your answer! Will do the tap water trick since surprisingly, this problem is still apparent. Have a nice day!!
HealthTap member
Thank you, your answer was very helpful! Many thanks for taking time out to share your valuable advice!
HealthTap member
Thank you, your answer was very helpful! Thanks for answering

Education & Training

Medical/Graduate school

University of Amsterdam Faculty of Medicine, Netherlands
Graduated 1963MD

Awards

Top Pediatric Ophthalmologist, First Place, National - Winter
2013
Top Pediatric Ophthalmologist, Second Place, National - Summer
2013
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