Tag Archives: Focus Light

Video – Description of Cataracts. What Are Cataracts?

Cataract Description

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The above video is from EyeMaginations and gives a great description of what Cataracts are:

Cataracts are a normal and common part of the aging process but, they do not have to interfere with your lifestyle.   A cataract is a cloudiness of the crystalline lens inside of your eye.  As your lens gets cloudier, your vision will gradually become more blurred.

The human eye may best be compared to a camera.  When you take a picture, the lens in the front of the camera allows light through and then focuses that light on the film in the back of the camera.  When the light hits the film, a picture is taken.  The eye works in much the same way.

In  youth, the crystalline lens of your eye is clear and allows light to pass through.   Light is focused by your cornea and your crystalline lens onto a thin layer of nerve tissue in the back of your eye called – the retina.   Your retina works like the film in a camera.  When the focused light hits the retina – a “picture” is taken and sent to your brain.

While a dirty camera lens blurs a picture, any significant cataract or cloudiness  in your crystalline lens will blur the images that you see.

When a cataract becomes significant – your vision can become quite blurry.  It is suggested if your vision drops below 20/40 or so….then it is common to be told to see an eye surgeon to have cataract surgery.

This surgery involves taking out the cloudy crystalline lens (cataract) and replacing it with a clear implant.  Often your surgeon can even do a calculation that can place your current eyeglass prescription into the lens implant.  The result after the cataract surgery can be much clearer vision and often there is no need for glasses after the surgery!

For more information – see your local Optometrist or  Dr Dawn Bearden or Dr Anna-Kay Tenn in Pembroke Pines 954-430-3808 or Sunrise 954-851-9949 for your yearly eye exam and they will be happy to discuss cataracts and cataract surgery options with you!

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Video – Eye Anatomy: The Cornea…and Contact Lenses, Degenerations and Keratoconus

Your eye is like a camera.  There are 2 structures that focus light – much like the lens of a camera.  These 2 structures are the cornea and the lens.  The cornea is the clear front surface of your eye that is located in front of the colored part of your eye (called the iris).

If you are a contact lens wearer – the contact lens sits on the cornea.  Not all corneas are the same size.  Some are more curved or “steep” and others are more “flat”.  It is important to be properly fit for contact lenses by your eye doctor.  If a contact lens is not properly fit, the contact can cause serious problems for the wearer – including corneal distortion, corneal swelling, corneal ulcers, inflammation and more.

A corneal topographer is an instument that can detect any corneal distortions caused from a contact lens.  A contact lens may look and feel “fine” but, it can still be causing problems that you may be unaware of.  Many times sleeping in your contact lenses or overwearing your contacts (wearing a 2 week contact for more than 2 weeks) can cause corneal distortions.

Cornea With Keratoconus

Cornea With Keratoconus

At Visionary Eyecare in Pembroke Pines, Sunrise and Davie- we perform a corneal topography on ALL contact lens patients. During the contact lens eye exam we use the corneal topographer to monitor the health of the patient’s cornea before fitting with a new contact lens and also to monitor the corneal health year to year for established contact lens wearers.

Corneal Topography can also detect some corneal degenerations and corneal dystrophies like keratoconus.  Typically a person with keratoconus has a lot of astigmatistm, distorted vision and possibly sensitivity to light.  The cornea starts to protrude in a “cone-like” fashion.  Most of the time a specialty contact lens can help these patients see clearer and may prevent the corneal dystrophy progression.  In advanced cases, the apex of the cornea may thin so drastically from keratoconus that a corneal transplant may be necessary.

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Video – What is Astigmatism? A Video Description of Astigmatism

Astigmatism is a refractive error –  meaning that the light that is coming into the eye is not focused perfectly on the “film” in back of the eye (called the retina – which is a layer of nerve tissue).  The retina is much like a movie screen or the film in your camera – the image must be focused PERFECTLY on the retina for the eye to see clearly.  If the image is focused in front of the retina or behind the retina – much like a movie screen or camera film – the image will be blurry.  This unfocused image is sent by the retina to the brain – where it is perceived as blurry, cloudy or distorted vision.

Astigmatism is a refractive error caused when the front surface of the eye (the cornea) or the lens (which is located inside the eye behind the colored part of the eye – called the iris) is irregularly shaped and oblong – much like a football.  This irregular shape causes the light to be focused on 2 seperate points – either in front of or behind the retina.  This causes distortion of the vision and blur at all distances.  So objects at a distance and also nearby are blurry and/or distorted.  The higher the degree of astigmatism – the more distortion and blur you will have.

Several methods can focus the light perfectly on the retina for you.  Glasses, contact lenses (called astigmatic or toric contacts) or laser vision correction are aids that are available to help focus the light and images on the retina – which will get you to see clearly again!

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