Tag Archives: Retina

Online Eye Test For Astigmatism

Astigmatism is a visual condition caused when some surfaces of the eye are oval shaped….like a football or an egg.  These surfaces in the eye that are oval shaped can be the cornea (the front of the eye) or the lens (inside the eye). Most often astigmatism is caused by the cornea being oblong or oval shaped.

This oblong shape causes the light rays that enter the eye to be distorted and not focus properly on the retina in the back of the eye.  If you have uncorrected astigmatism, you can have various symptoms such as blurry vision, eyestrain, tired eyes, headaches or fatigue.

Here are several links to websites that have online testing for astigmatism. Check them out!!

CLICK HERE for ONLINE ASTIGMATISM TEST #1

CLICK HERE for ONLINE ASTIGMATISM TEST #2

CLICK HERE for ONLINE ASTIGMATISM TEST #3

CLICK HERE for ONLINE ASTIGMATISM TEST #4

Astigmatism can be quickly and easily corrected with eyeglasses, contact lenses (called astigmatic or toric contacts) or Laser Surgery (called Lasik).

If you feel that you may have astigmatism and you need correction OR if has been more than 12 months since you have seen an eye doctor…..its time for you to schedule an eye exam!

Astigmatism Diagram courtesy of:

Click on the WebMD Logo above

to check out more information on Eye Health!

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Online Eye Test: Find Your Blind Spot in Each Eye!

Everyone has a BLIND SPOT in their vision of each eye.

Take this FUN test to check it out for yourself !!

Look at graphic of the cross and the circle at the top of this post.

Sit at your computer with your nose pointing in between the cross and the black circle.

Cover your LEFT eye and stare at the cross with your RIGHT eye.

Now SLOWLY move towards the computer screen while still staring at the cross with your RIGHT eye.

At somewhere around 10-14 inches from the computer screen – the black circle will disappear and the area where the black circle was…will now be all white – this is your BLIND SPOT.

If you move closer to the screen or farther away –  the circle will re-appear.  At just the right distance – the circle will disappear.

Now try the OTHER eye…but this time cover your RIGHT eye and look at the CIRCLE with your LEFT eye…..move closer and you will see that the CROSS now disappears!!

Your eye has an inner lining which is made of a sheet of nerves.  This sheet of nerves is responsible for your vision and what you see and it is called the RETINA.  There is a “hole” in the sheet where the Optic Nerve enters the eye.  This area is called the Optic Nerve Head.

Photoreceptors are cells in the retina that detect light and allow you to perceive “vision”.  On the optic nerve head there are NO photoreceptors.  Thus, there is no light or vision detected at this spot in the retina.  This is your “Blind Spot”.  Every eye has a blind spot….your blind spot in your right eye is slightly on your right and your blind spot in your left eye is slightly on your left.

Your brain automatically “fills in” the blind spot area for you…..

Now try it AGAIN with the above green and yellow graphic….but this time you will notice that when you move to just the right distance , the circle will disappear and your brain will fill in your blind spot WITH YELLOW when you are looking with your right eye (left eye covered)….and your brain will fill in your blind spot WITH GREEN when you are looking with your left eye (right eye covered)!!  Your brain automatically matches the surrounding colors when it “fills in” visual information for you.

Cool huh??

Your brain can even “fill in” missing information for you…..in the above graphic, you’ll notice that when you cover your left eye and look at the cross with your right eye – the brain will “fill in” your blind spot (the area where the circle is).  You will see that your brain fills in the line for you.  Keep looking at the cross – don’t look back at the circle – or you will will see the circle again.

Try it AGAIN with the above graphic while looking at the cross with your right eye (cover your left eye) – your brain will put a red circle where your blindspot is….it is “filling in” the “missing information” !!

Amazing.

Graphics from Serendip….check out their very informative  website at http://serendip.brynmawr.edu/bb/blindspot1.html

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Online Amsler Grid Test for Macular Degeneration and Other Macular Disorders

The Amsler Grid test is a simple screening test used to assess the area in the back of the eye that is responsible for your most detailed vision (used for reading, seeing facial details etc).  This area is called the Macula and it is located in the center part of the retina (the nerve lining inside the eye – used for sight).

If there are any diseases or degenerations (like Macular Degeneration) that are affecting the Macula – then the Amsler grid test will usually provide early detection that there may be a problem going on.

HOW TO USE THE AMSLER GRID:

Position yourself at about 14-16 inches (about 40 cm) away from the grid.

If you have glasses that you use to read with – make sure you are looking thru the reading part of your glasses

Cover the left eye and use only your right eye to see the grid.

Stare at the white dot in the center of the grid with your uncovered eye.  Keep your eye focused on the dot.  Don’t move your eyes around to see any other part of the grid except for the white dot.  Use your side vision (peripheral vision) to see all the other parts of the grid.  “Glue” your sight to that white dot – don’t move your eye around at all.

While staring at the white dot:

  • Can you see all 4 corners of the grid?
  • Can you see all 4 sides of the grid?
  • Are any of the lines WAVY or MISSING or DISTORTED?   (All lines should look perfectly straight, all intersections should form right angles and all the squares should be the same size.)
  • Are ther any holes or “missing areas” in  the grid?

Then cover the right eye and repeat the steps with using the left eye to see the grid.

If you answered “YES” to any of the above questions then you need to see your eye doctor immediately. The eye doctor will examine the back of your eye and your macula VERY closely to determine if there are any medical issues causing these changes on the Amsler Grid test.

If you have been told that you have macular degeneration or any other macular disorder, you should be doing the Amsler Grid test at home DAILY.

The Amsler Grid is a great way to monitor your macular health but you should always have yearly eye examinations with dilation when dictated by your doctor.

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Video – Sunglasses are like Sunscreen for your Eyes: Protection from Aging Changes and Some Forms of Eye Cancer

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CLICK HERE

TO SEE A FOX NEWS VIDEO ABOUT EYE CANCER AND PROTECTION WITH SUNGLASS WEAR

The sun can cause aging changes to your skin… and also to your EYES.

Macular Degeneration and Cataracts are aging changes that can be brought on earlier in your life by exposure to the sun its ultraviolet (UV) radiation.  Wearing sunglasses with good UV protection can be like wearing sunscreen for your eyes.

There are many different types of eye cancer that can affect any part of the eye.  A patient can get cancer on the Eyelids, the Conjunctiva (the “skin” over the white of your eye), the Iris (the colored part of your eye), the Optic Nerve (the nerve from the eye back to the brain), the Retina (the nerve layer inside your eye – responsible for your vision), the Choroid (the blood vessels beneath the retina) and more.

The types of cancers that usually affect the skin (aka on the eyelids….basal cell carcinoma, squamous cell carcinoma, melanoma etc.. ) can be the same types of cancers that particularly thrive in sunlight and UV exposure – just like any other type of skin cancer.

EVERYONE (including children) should be wearing sunglasses with UV protection any time they are outdoors. People who are particularly vulnerable are those with with blue eyes, light complexions, work outdoors, have had any PREVIOUS skin cancer or who are taking any medications that make them more light sensitive.

Routine yearly eye examinations are the KEY to early detection and treatment for any types of eye cancer and any other type of eye disease

Click on the FOX News link to see an informative Video about Eye Cancer and Protection Against Aging Changes with regular wear of good UV protection sunwear.  It tells a story of a man who found a weird eyelid freckle…

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Get YOUR Vision and Eye Health Questions Answered!!

Lots of Our Patients Often Have the

SAME BURNING QUESTIONS….

What is Astigmatism??

Why do I now have problems reading up close when I turned 40??

What are those black floating spots in my vision??

What is a Cataract??

I need bifocals….can I wear contact lenses??

What is Glaucoma??

How often should I get my eye exam if I feel my vision has not changed??

What is a Retinal Detachment??

What is Myopia (Nearsightedness)??

What is Macular Degeneration??

My child passed the Pediatrician and/or School Vision Screening – does he/she still need an eye examination if he/she is not complaining of vision problems??

I have astigmatism….can I wear contact lenses??

What is Farsightedness (Hyperopia)??

Well, here is YOUR chance to get all of YOUR questions answered by Dr Bearden and the Visionary Eyecare Doctors – Right HERE on Our BLOG!!

Just leave a comment (Below this post – click on “Comments”) with your burning Vision and Eye Health question(s) and we will write future posts based on the questions that you ask….

Check back often to see if your question has been answered…..OR……… subscribe to our blog  via email (or RSS feed) and get all updates of new BLOG posts sent to you automatically.

CLICK HERE to subscribe to our Blog Via Email.

Its THAT easy!

You are also welcome to visit our Vision Library on our Visionary Eyecare Website for LOTS of Vision and Eye Health Educational Information!!

CLICK HERE to go to our Vision Library….

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Optical Illusion….How Many Black Dots Do You See??

black dots optical illusion

Here is an interesting Optical Illusion for you!!  How many black dots do you see??  There are NONE!!

Keep staring at one of the white dots….you will see that it is white and never black…only the ones that you are not directly staring at seem to be “blinking” black or gray.  Cool huh??

It is your Retina playing tricks with you….creating an AFTER-IMAGE.

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