Posts Tagged ‘Refractive’

Refractive Laser Surgery

Refractive laser surgery is usually performed for correcting common ailments of the eye such as myopia and astigmatism. All refractive surgeries do not employ the use of laser. Some surgeries such as Radial Keratotomy (RK) do not employ laser although they are equally effective in curing refractive ailments of the eye. Some common types of refractive laser eye surgery include Lasik, PRK and LASEK.

Common Method of Refractive Laser Surgery
There are various methods employed for refractive laser eye surgery. These are divided into flab procedures and surface procedures.
* Flap Procedures: In such surgeries, a particular type of blade known as microkeratome is used for cutting a flap in the corneal tissue. The most common example of surgery under this method is called Lasik.
* Surface Procedures: In this process an excimer laser is employed for removing the front portion of the corneal stroma. Unlike the flap method this approach does not require the partial thickness cut in the stroma. Thus differentiating this method of handling the epithelial layer from the flap method. Photorefractive Keratectomy (PRK) and Laser Assisted Sub-Epithelium Keratomileusis (LASEK) are two common examples of surface procedures of refractive laser surgery.     

Examples of Refractive Laser Surgery
Lasik: This acronym stands for Laser Assisted In-Situ Keratomileusis. In this surgery, a flap is cut with the help of microkeratome blade. The thickness of such flap could be between 100 to 180 micrometers. The flap is then lifted and an excimer laser is used to remove the targeted tissues from the corneal stroma. The flap is then replaced after the removal of the unwanted tissues.
IntraLasik is another variant of this surgery. In this method the flap is cut with the help of laser. Where a microkeratome blade is used to create the flap, the proceedure is known as “traditional Lasik” in order to differentiate it from other forms of refractive laser surgery.
PRK: Photorefractive Keratectomy (PRK) was widely used for correcting the vision problems before the popularity of Lasik. In this surgery, the paitents recovery time takes longer than with Lasik.
LASEK: It stands for Laser Assisted Sub-Epithelium Keratomileusis and in this surgery, surface methods is used for correcting the vision problem.

The Laser Eye Center of Silicon Valley specializes in refractive laser surgery. This vision correction center specializes in all forms of Lasik, PRK and LASEK refractive laser eye surgeries.

Welcome to Laser Eye Center of Silicon Valley, one of the finest refractive laser surger centers in California.

Article Source:http://www.articlesbase.com/vision-articles/refractive-laser-surgery-1621454.html

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Laser Vision Correction

If you dream of freedom from glasses or contact lenses laser vision correction may be the solution for you. LASIK is the most well-known vision correction procedure, but there are several other types of laser vision correction. By reshaping your cornea, your ophthalmologist can correct nearsightedness, farsightedness, and astigmatism, giving you clear vision without the hassle of corrective lenses.

Refractive Error

Nearsightedness (myopia), farsightedness (hyperopia), and astigmatism are all forms of refractive error. Your cornea bends, or refracts, light to focus on the retina. When your cornea is misshapen the light does not focus properly. Refractive surgery reshapes your cornea, correcting how the light is bent and therefore correcting the focus of the light on the retina.

Types of Laser Vision Correction

You have probably heard of LASIK, but might not be aware that there are two types of LASIK, traditional and custom, and that there are several other forms of laser vision correction including:

  • Epi-LASIK
  • iLASIK
  • LASEK
  • InterLase
  • PRK

All are performed using an excimer laser. The technique is different for each type of laser surgery, making laser vision correction possible for people who are not good candidates for LASIK.

The Precision of Today’s Laser Vision Correction

Refractive surgery is not new, but it is being constantly improved. Traditional LASIK has been used to safely and effectively correct vision for over twenty years. Custom LASIK is far more precise, and can give you even clearer vision.

In custom LASIK, Wavefront technology is used to map your eyes and guide the laser. Wavefront is also used to guide other types of laser vision correction. Wavefront diagnosis helps your ophthalmologist determine which type of laser surgery is right for you, and can detect high order aberrations that can be made worse by LASIK surgery.

Improving Your Vision and Your Life

Laser vision correction can mean freedom from corrective lenses for many patients. Those with very poor vision can achieve better corrected vision. Improving your eyesight can open up opportunities that you never had before. It may simply make things like swimming and other hobbies easier and more fun. For some, it can make essential activities, such as driving, possible. Getting rid of your glasses or contacts means waking up each morning with clear vision and never again having to worry about losing or damaging your lenses. To learn more about laser vision correction and what you can do to improve your vision please visit eyes.com today.

To learn more about laser vision correction and what you can do to improve your vision please visit Eyes.com today.

Article Source:http://www.articlesbase.com/vision-articles/laser-vision-correction-1600068.html

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The Advantages of PRELEX Cataract Procedures

Cataracts are a serious medical problem that will affect four out of ten adults over the age of 60, and almost 70% of adults over the age of 75.  Cataracts, a clouding of the lens in the eye, can result in impaired vision and even blindness.

The PRELEX Procedure

One of the surgical procedures used to treat cataracts is Presbyopic Lens Exchange, or PRELEX.  In this procedure, a small incision is made in the eye, the diseased lens is removed, and an artificial, intra-ocular lens (IOL) is replaced.

Why PRELEX for Cataracts?

Along with cataracts, many adults, as they age, begin suffering from what is known as presbyopia, a condition that prohibits the ability to focus on close objects.  The advantages of the PRELEX procedure for cataracts are that the procedure can fix two problems with one procedure.  Also, the PRELEX procedure has these added benefits:

  • Elimination of any chance for future cataracts
  • Procedure can be performed on patients’ with corneas too thin for LASIK
  • Recovery of unaided distance vision
  • Recovery of unaided near vision

Further, the PRELEX procedure, in fixing the cataract and the presbyopia conditions, can severely limit or fully eliminate the need for glasses or contact lenses.

The PRELEX Experts

Cataracts can be debilitating, but you do not have to live with them.  Dr. Khanna and his team at the Khanna Institute of LASIK and Refractive Surgery are experts in performing the PRELEX procedure and can remove your cataracts while reducing or even eliminating your need for glasses or contacts.

If you or a loved one suffers from cataracts, please visit the website of the Khanna Institute of LASIK and Refractive Surgery for a free vision consultation.

If you or a loved one suffers from cataracts, please visit the website of the Khanna Institute of LASIK and Refractive Surgery for a free vision consultation.

Article Source:http://www.articlesbase.com/vision-articles/the-advantages-of-prelex-cataract-procedures-1475162.html

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Refractive Errors and Lasik Eye Surgery

Refractive Errors: Myopia, Hyperopia and Astigmatism

Clear vision in the normal eye is due to the light rays falling on the eye and passing through the cornea, pupil and lens and focusing the image on the retina. An error in the focusing of light by the eye is called as Refractive Error. If the optical power of the eye is too large, light produces image focus in front of the retina and this is called as Myopia (Short-sightedness). If the optical power of the eye is too small, light produces image focus behind the retina and this is called Hyperopia (Long-sightedness). When the cornea is shaped like the back of a spoon, light gets focused on more than one point and a blurred image is formed on the retina and this is known as Astigmatism (Cylindrical Error) and is often associated with short sight or long sight.

Treatment Options for Refractive Errors:

There are different types of temporary and permanent treatment options for Refractive Errors. They are:

Temporary Options

This is the most common temporary solution to correct refractive errors because of easy maintenance and low cost. The drawbacks of spectacles are obvious. They interfere with activities and change a person’s appearance. Additionally, spectacles also reduce the peripheral vision.

Contact lenses are a popular alternative to spectacles. They provide excellent peripheral vision and permit a wider range of activities than spectacles.
Contact lenses do not change a person’s appearance. Problems with contact lenses include their recurrent costs, maintenance hassles and possibility of infection and intolerance due to sensitivities.

Permanent Options

There are various surgical options available for the permanent correction of these refractive errors. Your physician must choose the best treatment for your specific disorder. The person who wants to undergo a permanent treatment should be above 18 years and should have a stable spectacle power for over a year. S/he should not be suffering from other eye disorders like cataract, glaucoma, retinal disorders etc.
S/he should stop wearing soft contact lenses for 1 week & semi-soft contact lenses for at least 2 weeks prior to the procedure or measurements. Following are the permanent surgical treatments available for Refractive Errors:

Lasik (Laser in Situ Keratomileusis)

In Lasik, the corneal surface is reshaped using a laser beam. It corrects vision by altering refractive power of the eye by a calculated change in the corneal curvature. The image of the outside world is now focused sharply on the retina.

Wavefront Lasik or Customized Lasik

Wavefront Lasik or Customized Lasik is the result of a quantum leap in technology of sight restoration and enhancement. This Wavefront Guided Lasik is a giant step after conventional Lasik. Optical aberrations (imperfections) inherent in the eye may adversely affect the visual acuity and the optical performance of the eye. Conventional Lasik Eye Surgery can only correct the spectacle power & not these subtle optical aberrations. With Wavefront Guided Lasik, it is now possible to reduce these aberrations and enhance vision much above the normal levels.  Custom Vue (VISx star S4 from AMO) is the procedure available for customized Lasik.

Benefits of Lasik/Customized Lasik

  1. Simple to perform
  2. Predictable
  3. Stable
  4. Brief recovery time
  5. Minimal discomfort
  6. Minimal post-op care
  7. Low enhancement rate
  8. Very low infection rate
  9. Very low risk of scarring

Dr. Sri Ganesh’s main interests are Cataract (Phacoemulsification) and Refractive Surgery. He has been in the forefront of latest technologies for Phacoemulsification and Refractive Surgeries. In the field of Refractive Surgery, he is one of the few persons to start Lasik Eye Surgery, Verisign Phakic IOL’s, Toric ICL’s, Conductive Keratoplasty, Intra Lase Custom Vue Lasik in South India. He has received ‘Best Phaco and Refractive Surgeon Award’ for the year 2006 from Indian Intraocular Implant and Refractive Society.

Article Source:http://www.articlesbase.com/vision-articles/refractive-errors-and-lasik-eye-surgery-1121160.html

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