Frequently asked question: what does my child see? A few vision simulators with caveats

July 28, 2014 Leave a comment

There’s a cliche of “looking through your eyes” as a way of trying to see the world as someone else might. It’s usually not meant literally, of course, but  it reflects our desire to understand how others see things. That’s certainly true when you learn that your child has a vision problem.  It’s very common to wonder how your child had been seeing.

what do you see4

Very young children don’t have the words to tell us what they want for dinner, let alone how they see.  Even older, more verbal kids have difficulty explaining how things look. It wasn’t until Zoe was 4 that she started telling me that things were fuzzy without her glasses. But the first time I really understood how she saw was after a trip to the science museum where she visited a human development exhibit.  They had glasses you could put on that approximated how babies’ vision develops in their first few months. “Mom, babies see really blurry they’re first month. Then at 2 months, they see the way I see without my glasses. By a year, they see how I see with glasses.”  Finally, I could put on glasses and see the world the way Zoe does with glasses.

If you can’t make it to a human development exhibit, there are quite a few online vision simulators that claim to let you see how another person sees, most are based on a person’s glasses prescription.  Of course, there are a lot of problems with even the best of these.  In fact:

A glasses prescription will not tell you exactly how a person sees

A glasses prescription will only tell you what shape the lenses on a pair of glasses or contacts should be in order to have the best possible corrected vision.  This is based on how much the shape of the eye differs from what it should be to see clearly (something called the refractive error).  Some (not all) of the reasons why someone may see differently than their glasses prescription implies include:

  • Hyperopic children can often compensate for much of their hyperopia, allowing them to see relatively clearly.  This does cause eye strain and can pull the eyes out of alignment, which is why glasses are still important.
  • Amblyopia is when a person does not see clearly even when glasses or contacts are correcting for the full refractive error.  Generally this is due to the brain suppressing the vision from one or both eyes.  It can be caused by the eyes not lining up, an eye having an injury, or one eye having a much stronger refractive error than the other.
  • There may be other problems in the visual system (either in the eye structures, the optic nerve, or the brain) that is causing vision problems.

One very simplified way of looking at it is imagining the visual system as a camera.  The lens of the camera may not be in focus, that’s the part that glasses can fix that.  But there are a lot of other components of the camera that may not be functioning correctly, and any one of them can lead to unclear vision.

Visual Acuity

The measurement that best describes how clearly a person sees is their visual acuity.  It is usually expressed as two numbers, like 20/20 or 6/6.  The first number tells you the distance at which the measurement was taken (20 or 10 is in feet, 6 or 3 is in meters).  The second number tells you how far away a person with good vision could be to see what you see clearly.

For example, the visual acuity of my left eye without glasses is around 20/200.  That means that what I see clearly at 20 feet away, a person with good vision would see clearly at 200 feet away.  (I do not see terribly well in that eye).  There’s a conversion chart here that converts between metric and US measurements as well as giving reading performance for those acuities.

If you’d like to see what a specific visual acuity looks like, there are a couple of options:

Wolfram Alpha will show you a simulation of any acuity you type in.  Simply type in the visual acuity with the word “vision”: in this case “20/200 vision” (if you don’t include the word “vision” it’ll just calculate the fraction for you).

20-200

Wolfram Alpha’s simulation of 20/200 visual acuity. I typed “20/200 vision” in the search box to get this.

Fork in the Road Low Vision Simulators are vision simulators that you can purchase and wear to see the effects of different eye diseases.  Their cataract simulators demonstrate reduced visual acuity.  On their website, you can see examples of the blur simulation for 20/80 (6/24), 20/200 (6/60), 20/400 (6/120), and 20/800 (6/240).  Scroll through the page to see the different acuities.

 Vision Simulators based on Prescription

As I mentioned, vision simulators based on a glasses prescription are flawed at best.   Even the very good ones will only show you an approximation of how someone with no other vision issues would see with that prescription.  That said, the simulators can give you a feel for how strong a prescription is and how your child might be seeing without glasses.

  • Eyeland Web Tools – there are different simulators for different refractive errors.  Many children have a spherical (hyperopia or myopia) component as well as an astigmatism component.  I like that these allow you to see how those different components affect vision.
  • Sehschärfen Simulator – this site is in German, but is still pretty straight forward to use.  One of the features is that it changes the simulation based on a person’s age, so that the effects of hyperopia (farsightedness / longsightedness) are reduced for young children.  This means if your child has a + prescription, you may think from this simulator that your child shouldn’t need glasses.  This simulator will not show you how much eye strain a child will have due to hyperopia.
    1. Enter your child’s age in the “Alter” box
    2. Enter the spherical and cylinder amounts
    3. Click “Berechnen”
    4. The top image is the simulated vision, the bottom image is what would be considered “normal” vision.

Other visual simulations of eye diseases

  • Fork in the Road sells vision simulators for many eye diseases resulting in low vision.  This includes cataracts (linked above), glaucoma, and more.
  • Inclusive Design Kit from the University of Cambridge also has a simulator for many vision problems.
  • Causes of Color includes a vision simulator for various types of color blindness and cataracts.

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heartbreaking photo of glasses meet garbage disposal

July 22, 2014 Leave a comment

 

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photo credit Gina Glorioso Rendall

Sometimes you see a photo, and read the explanation and your heart just sinks:

“Totally heartbroken – my one-year-old dropped his glasses down the sink and they went through the garbage disposal.”

Posted to the Little Four Eyes facebook group, shared here with permission.


My book is published

July 10, 2014 3 comments

I’ve posted a bit about the children’s book about glasses that I’ve been working on – it’s one that I held a Kickstarter project to raise the funding for.  Well I’m thrilled to say that the book has been published and is now available for purchase.  The whole experience has been fascinating, eye opening, way outside my comfort zone, but in the end, a really good experience. cover final The project was largely inspired by the comments I’d gotten on the photo gallery page.  I had figured the photo gallery would be great for parents to see the range of glasses available for kids, but I hadn’t expected that parents would show their kids the gallery, and that kids would feel better about their glasses after seeing other kids like them in glasses.  I also remember how much Zoe loved looking at books with pictures of kids, and I wanted her to see kids who wore glasses just like she did.  And I was also a bit sick of books that talked about kids who hated glasses or who were teased about their glasses.  Those are definitely good stories to have, but they didn’t reflect Zoe’s experiences at all.

After waiting for 5 years for someone else to write a book that featured photos of kids in glasses, I finally decided that I was going to have to do it.  And luckily, I knew that my friend Kristin from Peeps Eyewear was just as interested as I was in helping kids in glasses, and since she had published a children’s book, she knew a lot more about the process and had the contacts to actually make it work.  She agreed to be my publisher, for which I am so very thankful. I’m thankful, too, for so many of you who backed the Kickstarter or shared the project or gave me support (I wrote a bit about Kickstarter here and here).  I was able to get funding to cover most of the up front costs (photo shoot, graphic design, printing, etc). We held the photo shoot for the book in January.  The daycare center that my children attend was gracious enough to let us use their classroom (with fun colorful toys, and huge windows to let in the sunshine) for the photo shoot.

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Our photographer, Heide, was simply amazing.  She worked hard and had a fantastic rapport with the kids.  And the kids were all amazing, too!  It was honestly a lot of fun –  just watching these kids play and have fun, and watching Heide work her magic to get some amazing shots, and meeting the parents and hearing all about their stories. Then came more work – choosing photos, working with the graphic designer, trying to get the print run to be true to color, getting an ISBN for the book… all sorts of things that I had never, ever dealt with before, so again, I’m thankful for Kristin’s help.

It took longer than anyone of us had expected, especially since we had to not only produce the book, but also the other rewards for the Kickstarter backers.  But now I can hold all that hard work in my hands!

that's my hand...holding my book!

that’s my hand…holding my book!

I have to say one more huge thank you to all of you out there for your support and inspiration for this book.  I don’t know how I can thank you all enough.

 


Reader request: anyone with a child diagnosed with CHED?

Is there anyone out there with a child diagnosed with CHED (Congenital hereditary endothelial dystrophy), either recessive or dominant?   Another parent is really hoping to connect others facing the same thing, as it’s a rare disorder, their having trouble finding others out there.

Leave a comment, or drop me an email (ann@shinypebble.com) if you would like to connect.

 


Self-portraits of children in glasses

June 29, 2014 2 comments

There were some posts in the facebook group recently of pictures that kids had drawn with them in glasses.  They were all just too cute.  With parents’ permission, I thought I’d share them with you all.  I know it was quite a while before Zoe would draw herself with glasses.  It felt like a turning point when she started drawing herself in glasses.

 

Want more?  There’s some great drawings, tips, and even poems by kids in glasses at Kids’ Health: Eyes – wearing glasses (part of the Women’s and Children’s Health Network in South Australia).

Does your child draw pictures of him or herself in glasses?  Want to share?  Feel free to send me their drawing at ann@shinypebble.com!


Survey for US parents of blind or visually-impaired children

June 14, 2014 1 comment

Stephen sent the following:

Greetings,

I am visually impaired as are two of my daughters. I am also a firefighter and currently conducting research to see is blind and visually impaired persons are adequately taught education in fire prevention and life safety.

I am posing a link to survey for parents of blind and visually impaired persons. It is a Google Drive survey. I ask that you please take 10 minutes to complete it.

The goal is that my theory is supported and proves the need for education for VIP’s in fire prevention and life safety and hopefully provides the catalyst for change. I apologize, but only US residents feedback is needed as my focus of my research is in the US only.

Click here to take the survey

Children’s Eye Foundation 2014 photo contest – Best Buddies to See You Through

May 17, 2014 3 comments

It’s again time for the annual Children’s Eye Foundation photo contest for their calendar.  The Children’s Eye Foundation  is the foundation of the American Association for Pediatric Ophthalmology and Strabismus (AAPOS).

Take a look at this year's calendar.

Take a look at the 2014 calendar.

The theme for this year’s photo contest is “Best Buddies to See You Through“.  Once you submit a photo, people can vote on their favorites.  The top 10 vote-getters will win a camera, and a panel of judges will choose from all submissions the photos that are featured in the calendar.  Voting is open until August 31, 2014.

A number of kids from our community are featured in the calendar each year (of course they are – our kids are super cute!).

Take a look at the full rules for the contest, and submit your photo.   If you do submit a photo, leave a comment here letting us know which photo you submitted.

You can also vote for your favorite photo!  You can vote for one photo once each day.

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