Tag Archives: Optic Nerve

Diagram of Your Eye

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PLACE YOUR MOUSE OVER THE MAGNIFYING GLASS
AND USE IT TO MOVE THE MAGIFIER OVER
EACH PART OF THE EYE

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See the Inside of Your Eye …. the Way Your Eye Doctor Sees It!

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MOUSE OVER THE ABOVE IMAGE

TO SEE INTERNAL EYE STRUCTURES!

Your Eye Doctor needs to see the internal eye structures of your eyes to determine if your eyes are healthy.

You can move your mouse over the image above to see what your Eye Doctor sees during your Dilated eye health exam.  The doctor can see your optic nerve, your retina, your macula and your blood vessels inside your eyes.   Your doctor is looking for eye health changes like bleeding in your retina, tumors in your retina, macular degeneration, glaucoma, retinal holes, tears, detachments etc.

Most eye health issues DO NOT cause symptoms until it is too late…that is why is it VERY IMPORTANT to have an eye exam every 12 months even if your vision is not blurry and  has not changed at all.

Examining internal eye health can also help your Eye Doctor determine if you may have any SYSTEMIC problems going on that you may be unaware of – such as: Diabetes, High Blood Pressure, Cancer, High Cholesterol, Brain Tumors, Multiple Sclerosis,  Sickle Cell Anemia…and many, many  more.

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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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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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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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