Eye

Ask an Eye Doctor and Get an Answer ASAP

Ask a Doctor,
Get an Answer ASAP!

Eye
This answer was rated:

1) Is it theoretically (so: according to the laws of optical

physics) possible to do subjective...
1) Is it theoretically (so: according to the laws of optical physics) possible to do subjective eye testing on a computer screen, e.g. by blurring a picture in such a way that only a person with a specific correction can see it properly?
2) if not, why not? if so what would be the practical problems to overcome?
Show More
Show Less
Ask Your Own Eye Question
Answered in 5 minutes by:
10/9/2009
Dr. James
Dr. James, Board Certified Ophthalmologist
Category: Eye
Satisfied Customers: 2,287
Experience: Eye Physician and Surgeon
Verified
Hello,

Can you explain the reasoning behind your question? This will help me provide a better answer.
Is this question regarding a school assignment?
Ask Your Own Eye Question
Customer reply replied 8 years ago
I would be interested in looking at developing software for opticians if it is feasible
When we do subjective eye testing, we use 20 feet or 6 meters as the standard for distance visual acuity. That is far away enough to approximate what the vision would be at infinity.

If the letters are brought in closer, then the size of the letters need to be decreased as well. You also need a way to standardize the distance the patient is from the letters. In an exam room, there is a chair. In schools and such, there is line people need to stand behind. So for the computer screen, there needs to be a fixed distance and the ability to occlude one eye.

There are computer programs out there that displays eye charts, but my experience has been they are used at the standard 20 ft or 6 meters as well. If you are trying "computerize" the subjective part, that would be more difficult. When we ask "better 1 or 2" and so forth, we do not always get a reliable answer from the patient and therefore need to make adjustment during exam.

Remember to press the green ACCEPT button. It was a pleasure helping you with your question. Best wishes to you. Feel free to ask any additional questions.
Ask Your Own Eye Question
Customer reply replied 8 years ago

Thank you for your answer. So my question refers to the adjustments, not to the "fixed" eyecharts. So, if someone e.g. has -2 prescription in the left eye (no astigmatism) and you want to find out, could one make a program that adjusts a picture on a screen say starting at showing a picture that someone with -1 would see properly, and gradually moving down (0.25 D increments) to -2 in such a way that the person would see it properly?

So the process is basically the opposite of the phoropter: in the phoropter, you change the lenses until someone can properly see a fixed eyechart; instead of changing lenses, would it be possible to adjust a picture on a computer screen in such a way that once the patient indicates that the picture is clear, you can read the correction? Thanks again

I understand your reasoning, however, I don't think you are able to "adjust" the eyechart as oppose to changing lenses. You are still left with the problem of if you will automate the refraction or have a person do the subjective refraction.

To make an invention work, it should solve a problem and fill a need. In my view, the current system of using lenses works out well. This also gives a good approximation of what their vision will be with glasses because the phoropter is essentially a trial pair of glasses for the patient.

Please remember to accept if my answer has been helpful.
Dr. James
Dr. James, Board Certified Ophthalmologist
Category: Eye
Satisfied Customers: 2,287
Experience: Eye Physician and Surgeon
Verified
Dr. James and 87 other Eye Specialists are ready to help you
Ask your own question now
Customer reply replied 8 years ago
Thank you for your answer.
Customer reply replied 8 years ago
I did hit the accept button, did you recive money??? (i am new here)
your deposit was received. Thank you for the accept and asking your question. If you have other questions, please ask. Best wishes.
Ask Your Own Eye Question
Ask Dr. James Your Own Question
Dr. James
Dr. James
Dr. James, Board Certified Ophthalmologist
Category: Eye
Satisfied Customers: 2,287
2,287 Satisfied Customers
Experience: Eye Physician and Surgeon

Dr. James is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I feel so much better today, and upon further investigation believe that there is a chance that the responses I got saved me from a serious, even life threatening situation. I am very grateful to the experts who answered me.

Susan O.USA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

Dr. Dan B.

Dr. Dan B.

Board Certified Ophthalmologist

3,334 satisfied customers

Eye surgeon experienced in cataracts, glaucoma, retina & neuro-ophthalmology

Dr. Stan

Dr. Stan

Ophthalmologist

905 satisfied customers

Johns Hopkins Fellowship Trained, Certified and Licensed Medical Physician and Surgeon

Dr. Stevens

Dr. Stevens

Ophthalmologist

629 satisfied customers

Board Certified Ophthalmologist

Dr. Susan

Dr. Susan

Ophthalmologist

217 satisfied customers

Board Certified & Fellowship trained eye surgeon.

Dr. JP

Dr. JP

Ophthalmology, Oculoplastic Surgery

28 satisfied customers

Harvard Medical School, Massachussetts Eye and Ear

Dr-Trace

Dr-Trace

Board Certified Ophthalmologist

26 satisfied customers

Board Certified in General Ophthalmology

Dr. Daniel Jewelewicz

Dr. Daniel Jewelewicz

Board Certified Ophthalmologist

11 satisfied customers

Glaucoma Specialist, Associate Professor FAU, Teaching Faculty Bascom Palmer Eye Institute

< Previous | Next >

Related Eye Questions
I had PRK refractive surgery about two years ago. After the
I had PRK refractive surgery about two years ago. After the surgery, I had some dry eye and was prescribed Restasis and Lotemax eye drops. The Restasis caused some redness, but the Lotemax seemed to b… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
My daughter has been to the optician and he has referred her
My daughter has been to the optician and he has referred her to eye specialist at hospital .. he says the optic nerve was blurry! I've googled it and now convinced it's sinister! … read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
I have a prescription for glasses. They say I have 20/25
I have a prescription for glasses. They say I have 20/25 vision. my OD sphere 0.00 cyl -0.25 axis 100 OS sphere +.025 cyl -1.00 axis 060. Do I need glasses? … read more
Dr. A.S. Desai
Dr. A.S. Desai
Board certified general ophthalmologist
Master\u0027s Degree
1,570 satisfied customers
Had a crystal lens implant put in my L eye and lasik on my
Had a crystal lens implant put in my L eye and lasik on my right. I had a reading contact in the L eye prior to surgery for mono vision. One month after surgery and the vision in my L eye is not impro… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
I had cataract surgery and had a multifocal lens implanted.
Hello, I had cataract surgery and had a multifocal lens implanted. From the beginning I've seen halos around bright lights at night. But for a few weeks watching TV was great, then credits in bright c… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
Recently had an eye exam & new glasses, however just started
Recently had an eye exam & new glasses, however just started with having a type of cobweb, or occasional feeling of some obstruction or as if something is in the right eye. But no particles there, wha… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
I see through cracked glass only in the morning goes away
I see through cracked glass only in the morning goes away after a short while is that a retnal detachment … read more
Gaurav Gupta
Gaurav Gupta
MD, CEO
Post-Doctoral Degree
22 satisfied customers
Can a Technis ZLB00 lens be defective? I am having double
Can a Technis ZLB00 lens be defective? I am having double vision when looking out the side of my eye to the left. Looking straight on, the vision is almost sharp, but as I turn my head to the right, a… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
The last time I got glasses my doctor said I have the
The last time I got glasses my doctor said I have the beginnings of cataracts. He said it won't affect me for a while. I'm wondering if lasic eye correction would help with that. Let me know if this i… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
Last year I went to see an optician and she referred me to
Last year I went to see an optician and she referred me to an eye specialist at the local hospital because there were a few dark patches behind my eye. I've seen the pictures the dark patches look a l… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
Trying to determine if I can have a glass of wine this
Trying to determine if I can have a glass of wine this evening? Had cataract surgery early this morning... … read more
Dr.Saleem
Dr.Saleem
Consultant Cardiologist
Doctoral Degree
762 satisfied customers
I went to get a glasses prescription filled at Costco. The
I went to get a glasses prescription filled at Costco. The optician there measured my PD at 30.0 (right eye) and 30.0 (left eye). The following week I went to my eye doctor to have them verify the pre… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
I had cataract and lens replacement surgery last Feb. part
I had cataract and lens replacement surgery last Feb. part of cataract fell inside eye and required a second surgery 2 days later. I now have double vision that becomes clear about 1 in 20 blinks,have… read more
Dr. Phil, MD
Dr. Phil, MD
Internal Medicine Physician
Doctoral Degree
2,675 satisfied customers
Retina question- I was just told by optician who ordered a
Retina question- I was just told by optician who ordered a new prescription that a---/some non-eye cancers will result in noticeable changes in the retina.... Specificsllghe mention that retina change… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
I need cataract and HD lens procedures to edone as per eye
I need cataract and HD lens procedures to b edone as per eye doctor recommendation. … read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
Just received my new progressive lense glasses. I have been
Just received my new progressive lense glasses . I have been wearing progressive lenses for over 20 years wo any problem. The frames were always!!! Set at the top of my nose bridge with frames tight s… read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
I need my eye glass prescription that I had done at a school
I need my eye glass prescription that I had done at a school out of my current state, but they refuse to give me the numbers over the phone … read more
Dr. D. Love
Dr. D. Love
Doctoral Degree
10,392 satisfied customers
MY OPTICA, MY OPTICIAN TOLD ME THAT THERE IS SOMETHING WRONG
MY OPTICIAN TOLD ME THAT THERE IS SOMETHING WRONG BEHIND MY EYE. I … read more
wieyedoc
wieyedoc
Ophthalmologist & Retina Specialist
Doctoral Degree
619 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x