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About Dr. Margaret Placentra Johnston, OD
(Top Expert on this page)

Expertise
I can answer almost any question about vision and general eye health care. As a non-surgeon, I may not be able to answer very involved technical questions about surgical procedures or highly specialized medical treatments.

Experience
I hold the degree of Doctor of Optometry and was in full-time private practice for twenty-five years. Currently I have reduced my schedule to part-time to allow time to write a book on another topic.

Organizations
American Optometric Association, Virginia Optometric Association, Northern Virginia Optometric Society (and others unrelated to this topic)

Publications
Http://www.exploring-spiritual-development.com, http://www.BeliefStagesandGrowth.com

Education/Credentials
O.D. (Doctor of Optometry) Pennsylvania College of Optometry (now called Salus University,) B.S. Pennsylvania College of Optometry, M.A. (Education) Catholic University of America, B.A Catholic University of America.

   

You are here:  Experts > Health/Fitness > Medical Specialists > Ophthalmology & Optometry

SubjectDate AskedExpert

vision6/30/2009Michael J. Wojciak, O.D.
  Q: my eyesight is -6D. i want to know that i am in the catagory of visually handicapped or not?
  A: A patient can not be considered handicapped based on Rx alone. There usually must be severe acuity ...
pressure behind brow bone, etc...6/29/2009Dr. Margaret Placentra Johnston, OD
  Q: ..I can't find an experet in the sinus related field but thought you may be able to help. I have ...
  A: I must admit, I had never heard of ROHTO-V eye drops until you mentioned them. I quickly googled ...
pressure behind brow bone, etc...6/29/2009Dr. Margaret Placentra Johnston, OD
  Q: ..I can't find an experet in the sinus related field but thought you may be able to help. I have ...
  A: I cannot speak to all the rest of your problems. I do hope you find an answer. But please rest ...
contact problems6/29/2009Mitchell Axelrod
  Q: now, in the last month my left eye gets very red and sometimes painful when i wear my contacts. I ...
  A: Well since it's obviously contact lens use related, stopping them is safe and smart. It will ...
Pressure or pulling in left eye6/29/2009Michael J. Wojciak, O.D.
  Q: It started a 3 weeks ago when I wok up with the left eye very red in the left corner and watery in ...
  A: You have many issues involved here. Anytime there is any kind of pain or pressure, you need to see ...
pressure behind brow bone, etc...6/29/2009Dr. Margaret Placentra Johnston, OD
  Q: ..I can't find an experet in the sinus related field but thought you may be able to help. I have ...
  A: Well, that is quite a situation you have there. I assume the CT and EEG were done BECAUSE of the ...
Genetic counseling for myopia?6/29/2009Dr Anand Shroff, MD, FICS
  Q: I am a 33 yr old having very high myopia -8 and -10 with .25 astigmatism.My husband has astigmatism ...
  A: Do not worry. Myopia is not a disease and is increasingly common today with no genetic ...
ABOUT EYE POWER IN MEDICAL TERMINOLOGY6/28/2009Dr. Margaret Placentra Johnston, OD
  Q: I am 22yrs old male.I have applied for a job with a company.In the application form there is ...
  A: The numbers you list correspond to the 20/20 notation we use in the US. They refer to what distance ...
Spot in vision on one eye6/27/2009Dr Anand Shroff, MD, FICS
  Q: I have had a spot in my vision on my right eye for a couple of days now. It looks like a spot you ...
  A: Considering that this spot is stationary you would probably benefit from a dilated eye check to ...
Clear lens glasses6/27/2009Dr. Margaret Placentra Johnston, OD
  Q: I used to be myopic and took laser surgery. Now my vision becomes normal and I can see things really ...
  A: Uv protection does not have any color to it, so though the lenses are clear, they may indeed have UV ...
2-yr old with intermittent aniscoria6/27/2009Mitchell Axelrod
  Q: My 2.5 year old is milestone delayed for speech and motor skills. Starting last winter she develped ...
  A: Anisocoria can be caused by brain issues but also sometimes by other things. The pathway for pupil ...
improved eyesight6/26/2009Michael J. Wojciak, O.D.
  Q: I am a 64 year old female and had my exam today to find out that my eyesight has improved ...
  A: You did not list whether you Rx number was minus (nearsighted) or positive (farsighted). Regardless, ...
colored contacts6/26/2009Dr. Margaret Placentra Johnston, OD
  Q: I just received my box of colored contacts from my optomologist and had a few questions. I usually ...
  A: People switching to colored contact lenses often notice this blur peripherally that arises from the ...
Neovascularization6/25/2009Dr. Margaret Placentra Johnston, OD
  Q: Margaret Johnston I have been wearing contact lenses (1-day lenses) for 6 years without any ...
  A: I can't tell you exactly how long your eyes have to suffer lack of O2 before the neov. forms or ...
Retinal Surgery6/25/2009Dr Anand Shroff, MD, FICS
  Q: Dr. Shroff, I'd like to ask one more question. After the Sclera buckle surgery was done in Sept. ...
  A: A retinal expert on our panel comments that "the only thing that i can think of is that PVR ...
disk drusan?6/25/2009Dr Anand Shroff, MD, FICS
  Q: i have been dianoised with optic drusan (i think its the buried one) it was confirmed that i have a ...
  A: Firstly do not lose hope and panic. All you need is close and regular follow ups. There is currently ...
Migraines6/25/2009Mitchell Axelrod
  Q: I'm 16 years old and i've been experiencing migraines for the past 6 months. I get them from ...
  A: You should see your eye doctor and see if they can help in any way, otherwise see your regular ...
Eye goo!6/25/2009Dr. Margaret Placentra Johnston, OD
  Q: What is the clear goo that i pull out of my eyes sometimes? It comes out in long strings. Before i ...
  A: These are classic symptoms of ocular allergy. Your eye doctor can prescribe some very good drops to ...
Puffy Eye Lids6/25/2009Dr. Margaret Placentra Johnston, OD
  Q: I am a 44 year old woman who just had Gyn surgery and woke with swollen eye lids. Well the surgery ...
  A: Well, I do not know if there is any connection with the gyn surgery. Are you sure the problem is ...
Pressure in my right eye6/25/2009Michael J. Wojciak, O.D.
  Q: At the movies last night my right eye started feeling weird. It was as though I couldn't keep it ...
  A: If you are concerned I would call your eye doctors office first ASAP. I do not know where you live, ...
Neovascularization6/25/2009Dr. Margaret Placentra Johnston, OD
  Q: Margaret Johnston I have been wearing contact lenses (1-day lenses) for 6 years without any ...
  A: I can understand your concern about the neovascularization. I was a little bit confused about the ...
Left Eye6/23/2009Dr. Margaret Placentra Johnston, OD
  Q: i bang the top of my eye playing football in a head clash.. my eye cut swelled up and bruised.. i ...
  A: Hmm. This is a tough one. Did they x-ray or do any kind of scan to find out if any orbital bones ...
detached retina6/23/2009Dr Anand Shroff, MD, FICS
  Q: On Sept. 29,2008 my wife had a scelera buckle operation done for a detached retina. Although ...
  A: Although, I am not a retinal expert, I know that recovery is slow. If her vision has stabilized, by ...
Contact lenses6/23/2009Dr. Margaret Placentra Johnston, OD
  Q: How long should I wait after waking up in the morning to put in contact lenses? Are soft contact ...
  A: While waiting a while to put your contact lenses in after getting up is not mandatory, I have always ...
One pupil dilates differently than other6/23/2009Mitchell Axelrod
  Q: I am a 28 year old female. About 2 months ago, I happened to look into a mirror and notice that my ...
  A: You probably should believe your doctor that is is a 'migraine equivalent' not due to headaches. ...
Transposing an Rx6/23/2009Michael J. Wojciak, O.D.
  Q: My question is why do opticians transpose an Rx?? Thanks and if you could just e-mail me that would ...
  A: Here in the US, the only Rx's which get "transposed" are the ones written in plus cylinder form ...
Prescriptions6/22/2009Dr. Margaret Placentra Johnston, OD
  Q: First, thank you for doing this...it's a really nice thing to do and it helps so many people find ...
  A: Your "figuring out" what power of glasses would give you 20/40 or 20/30 would be of no real use ...
prescription...what does this mean?6/22/2009Dr Anand Shroff, MD, FICS
  Q: Can you tell me what the following means as far as vision: Dist. R: -.750 (sphere Dist. L: -.250 ...
  A: This basically means that you do have a fairly high number which requires the use of glasses or ...
Visual halo6/22/2009Mitchell Axelrod
  Q: I am a 32yr old woman who is slightly short sighted, my eye problems seemed to start at around 20 ...
  A: You are perfectly describing an 'ocular migraine' also called ophthalmic migraine. No worries, as ...
Red line in eye.6/22/2009Dr. Margaret Placentra Johnston, OD
  Q: A while ago, I became aware of a thin red line running from the inner corner of my right eye ...
  A: Ok, I did think you would need at least a week to tell if the tears were helping. And I was not as ...
Changes in Base Curve6/21/2009Dr. Margaret Placentra Johnston, OD
  Q: I recently went to eye doctor for my annual visit and b/c I noticed my vision was changing again ...
  A: It is not terribly common for the base curve to "change." Choice of base curve is usually based on ...
Nose pads6/20/2009Dr. Margaret Placentra Johnston, OD
  Q: I had new nose pads put on and they don't move. They readjusted glasses for me, nose pads are little ...
  A: This depends on how they are mounted. The silicone pads with a little bump on them that fits into a ...
Red line in eye.6/20/2009Dr. Margaret Placentra Johnston, OD
  Q: A while ago, I became aware of a thin red line running from the inner corner of my right eye ...
  A: I am so sorry that being uninsured is preventing you from seeing a doctor when you need one. This ...
3yr old with astigmatism6/20/2009Mitchell Axelrod
  Q: Recently, I took my children for their eye exam. This was the first exam for my 3 yr. old. During ...
  A: If you don't trust the doctor or his findings, you should get a second opinion. According to the ...
my son was diagnosed as farsighted6/20/2009Dr. Margaret Placentra Johnston, OD
  Q: The optometrist said that our son is extermely farsighted. He is 8.5 months old and is +10 in rt ...
  A: Yes, I believe your son does need glasses. While young children are often farsighted, +10 and +12 ...
eyelid twitching6/19/2009Dr. Margaret Placentra Johnston, OD
  Q: my left eyelid [upper] has been twitching for a month. Some days seem worse than others and when it ...
  A: A lid twitching is called myokymia. I sort of doubt it is an official case of blepharospasm as this ...
Possible Eye Problem6/18/2009Dr. Margaret Placentra Johnston, OD
  Q: Johnston, My right eye seems to be constantly vibrating, when I close my eyes and put my finger ...
  A: I am sorry. I really cannot imagine what "random bursts of bubbling sensation" would be. I would ...
Eye Flashes6/18/2009Dr. Margaret Placentra Johnston, OD
  Q: I occasionally get this flashy thing in my eye, it starts out a little spot where i cant see and it ...
  A: The symptoms you describe are very compatible with the diagnosis of migraine. But with the ...
contact lens/red eyes/inflammation6/16/2009Dr. Margaret Placentra Johnston, OD
  Q: I've been wearing contacts for 18 years (gas permeable the first 9 years, and 2 week disposable ...
  A: Has anyone recommended you try a different contact lens solution yet?? The symptoms you report ...
Conductive Keratoplasty6/16/2009Dr. Margaret Placentra Johnston, OD
  Q: my name is Jon, and I was wondering if optometrists could perform conductive keratoplasty? ANSWER: ...
  A: This is a very good argument in favor of allowing OD's to do this procedure. I do not know if the ...

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Questions by
Active Experts:
James NevinsMitchell AxelrodMichael J. Wojciak, O.D.
Dr. Margaret Placentra Johnston, ODDr Anand Shroff, MD, FICS 

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