Posts Tagged ‘custom’

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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LASIK and Night Vision

Night vision problems have been reported as common side effects of traditional LASIK. If you have Custom LASIK, they are far less of a problem. That is because of the way your eyes are diagnosed in those two ways of doing LASIK.

Diagnosis for Traditional LASIK

In Traditional (early) LASIK, a phoropter was used, which is how prescriptions are determined for glasses and contact lenses. A phoropter is a floor-standing device with many lenses. You sit looking through its aperture at the vision chart while someone flips between lenses asking you to read the smallest line of letters you can clearly see.

The information thus gathered is used to correct three vision problems:

  • Nearsightedness
  • Farsightedness
  • Astigmatism.

That meant that Traditional LASIK corrected only these three problems, and only to the same extent that glasses or contacts do it. These three problems are known as the Lower Order Aberrations of your eyes.

Diagnosis for Custom LASIK

In Custom LASIK, Wavefront technology is used for a far more accurate diagnosis. Instead of sitting at a phoropter, you sit at a large system which shines a light into each eye. It then measures and records the nature of the light reflected back from your two eyes.

The computer in this system converts this light data into two colored 3D maps showing the microscopic contours of each eye. These maps contain so much information that a more effective treatment can be based on them, correcting not just the Lower Order Aberrations but also the Higher Order Aberrations.

What Are Higher Order Aberrations?

They are mostly night vision problems:

  • Halos around lights
  • Starbursts (spiky brightness around light sources)
  • Ghosting (faint duplicate images)
  • Glare

Traditional LASIK improved visual acuity but left your eyes with their existing Higher Order Aberrations. Therefore they were noticed after treatment as defects in your quality of vision, and referred to as side effects.

Custom LASIK improves visual acuity and reduces or eliminates night vision problems as well.

Pupil Size and Traditional LASIK

Part of screening for good LASIK candidates includes measuring pupil size. If your pupils dilate wider than average they are admitting more light into the eye in dim lighting conditions. If you are asking for Traditional LASIK and already have night vision problems, you would not be a good candidate.

If your pupils are not too extremely large, your eye surgeon might be able to do Traditional LASIK safely. He could use a “blend zone”, using Variable Spot Scanning (VSS) technology to create a larger optical zone, effectively reducing these aberrations and decreasing night glare.

A Custom LASIK procedure would be a better option, as it would treat the existing night vision problems.

At the Laser Eye Center of Silicon Valley in California, you can have Custom LASIK using the best of current Wavefront technology. Dr. Gary Kawesch never compromises on quality. Why not contact experienced LASIK surgeon Dr. Kawesch today and schedule your free consultation?

Article Source:http://www.articlesbase.com/vision-articles/lasik-and-night-vision-1402898.html

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Choose Custom LASIK for Precision Vision Correction

If you are considering LASIK, you might wonder whether all LASIK procedures are the same. The answer is they are not.  Custom LASIK is a newer, more accurate form of the procedure that uses detailed analysis of your eyes to design a treatment plan that is significantly more accurate than traditional LASIK and far more accurate than prescriptions for glasses and contact lenses.

What is Custom LASIK?

Custom LASIK is a LASIK treatment designed not only to give you better vision, but to give you the vision that suits you best. This means that it gives you not only optically improved vision, but vision suited to your eyes and to your lifestyle. It is functionally better vision designed specifically for you.

Optical Defects in Vision

The defects in vision that we most often think of, like nearsightedness and farsightedness, are optical defects.  In an ideal eye, the cornea focuses light from objects directly on the retina so we see a clear image.  However, in eyes with nearsightedness, farsightedness, or other optical defects, the image either focuses in front of, behind, or with distortion on the retina. This affects not only your ability to see sharp images like letters on an eye chart, but your perception of contrast, color, and other aspects of the world around you.

Custom LASIK is able to identify and correct more different types of optical defects than regular LASIK, giving you better vision from an objective standpoint.

Functional Customization

In addition, custom LASIK can take into account lifestyle factors in designing a vision solution for you.  We noted above that vision defects can not only reduce the sharpness of your vision, but reduce your sensitivity to contrast and color.  If your job or hobbies depend on your ability to see color or contrast, custom LASIK will improve your vision for those purposes.

In addition, custom LASIK has the ability to address some of the artifacts of regular LASIK, namely the incidence of glare or halos seen when driving at night.  Because these are caused by what are known as higher-order aberrations that cannot be treated and are sometimes caused by regular LASIK, only custom LASIK has the potential to reduce glare or halos seen by all people, potentially even those with large pupils, although this cannot be guaranteed.

Anatomical Customization

Anatomical customization means that your treatment is designed for your eye. The size and shape of all the parts of your eye are assessed and used when designing your vision solution. This is done not only in the reshaping of the cornea, but in the creation of the LASIK flap.  Since LASIK flaps can be created at several thicknesses, this can also be customized to match your eye, as can the diameter of the flap, which is determined not only based on the optical correction necessary, but also on the size of your pupil.

Summary

You may not understand exactly how LASIK works or how all these customizations change the way your procedure is performed.  But what you should understand is that custom LASIK gives better results for you. It gives better results than are possible with contact lenses or glasses.  There is also much evidence that it gives better results than possible for people with uncorrected vision.

If you would like to learn more about custom LASIK and what it might mean for you, visit the website of 20/20 Institute, with offices in Denver, Indianapolis, and Portland.

Article Source:http://www.articlesbase.com/vision-articles/choose-custom-lasik-for-precision-vision-correction-1369433.html

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Contact lenses for personalized needs

People may need customized contact lenses if they have special eyes or high astigmatism, or they just need additional comfort and particular clear vision. Both RGPs and soft lenses are available for people’s personalized needs.

RGPs are commonly acknowledged that they provide clearer vision than soft lenses, especially for astigmatism. However, most of the traditional RGPs have a slight gap between the lens edge and the eye surface, in order to allow more oxygen in tears during blinking. It is still this special design which may make people uncomfortable, especially for those with irregular eye surface shapes. In this case, customized RGPs are designed to tackle this dilemma, which have different measurements and lens designs.

For conventional RGPs, an instrument called keratometer is used to measure the cornea’s curvature. And the curvature of conventional RGPs has three elements: the curve of the steepest meridian, the curve of the flattest meridian and the orientation of the flattest meridian. These measurements help doctors or manufacturers determine the curves of RGPs’ back surface. Conventional RGPs always have a central curve and two periphery flatter curves.

Custom RGPs require more complex eye measurements and lens designs. Unlike conventional RGPs, they need the eye’s several thousand points’ curvatures data obtained by a corneal topographer. All these curves are used to form multi-curved lenses, which conform more closely to cornea surface and create smoother point-to-point curvature changes. These measurements and lens designs provide more comfortable fitting for special eyes and also permit more oxygen to directly reach the eyes.

Custom contact lenses offer a change for everyone who has been disappointed by traditional RGPs. Custom RGPs are particularly useful for people with keratoconus and irregular corneal curvature, caused by eye injuries, failed LASIK or just born with that. Another type of custom RGPs are multifocal RGPs, which are created for presbyopia. In conclusion, custom RGPs provide a more effective way to correct myopia and astigmatism.

Soft contacts are also available in custom types, even if they are not as competitive as custom RGPs. But custom soft contacts do offer a better solution for high level astigmatism than conventional toric contacts, which are effective only for astigmatism below 2.5 diopters. Custom toric lenses offer higher powers as well as slighter increments.

Custom contact lenses may be your choice once you have failed in fitting some conventional contacts or you just want to make a change. Requiring additional time and skills, custom contacts cost about two times more than common contact lenses. You may contact your eye doctor for detailed information.

this article is come from:http://vision.firmoo.com/contact-lenses/contact-lenses-for-personalized-needs.html

Vision Library
is the information source in area of vision care, including eyeglasses, sunglasses, contact lenses, sports protective eyewear, vision error and diseases, vision surgery, ageing and kid’s vision etc., solely sponsored by Firmoo.com, an emerging online optical store.

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LASIK surgery- the perfect solution for a perfect vision

Are you tired of wearing glasses or do you feel the glasses do not suit your style or give you an elderly look and have contact lens intolerance, or do you feel that it is difficult to manage contact lenses? Do you like activities such as outdoor sports like golf, football, water sports or hiking but are inhibited to enjoy those due to glasses or lens wear?

The perfect and the only answer to all these problems is LASIK surgery for eye sight correction.

LASIK stands for LASER IN-SITU KERATOMILEUSIS. It is a new form of laser surgery that is capable of correcting a wide range of glass numbers. The procedure uses a computer-controlled excimer laser to reshape the cornea to correct vision. The laser reshaping is done under a protective flap of tissue to promote a very rapid recovery of vision and minimize discomfort.

Light falling on the cornea [the front surface of the eye] has a smooth curvature- referred to as a “wave front”. As this smooth wave front shape courses through the various optics of the eye, ocular aberrations (imperfections) are induced. It results in an irregular wave front curvature reaching the retinal surface, which degrades the retinal image quality. An aberration-free eye would result in a smooth wave front image on the retinal surface. Wave front-guided customized LASIK, also referred to as “customized ablation” or custom LASIK performs corrections based on individual wave front measurements.

Custom LASIK or Custom Wave front LASIK, treatment replaces “one treatment fits all” with a procedure that is tailored to the individual eye. While standard laser eye treatment (without Wave front guidance) gives very high quality results for the majority of patients, many peoples’ eyes are not ‘standard’. Their eyes might require a specially tailored treatment.

Thus, any individual above 18 years of age, who does not have unstable spectacle power, is not pregnant or nursing and not suffering from uncontrolled diabetes or vascular disease, is a good candidate for the surgery and can easily get his vision corrected through the wonderful LASIK surgery.

For more information about LASIK, visit http://indicurecosmeticsurgery.com/Laser-spectacle-removal.html or http://indicure.com/lasik_laser.html or write to http://indicurecosmeticsurgery.com/ContactUs_php.php

Sonia srivats is Head of the patient care services at Indicure, the premier Healthcare Company of India, which provides expert medical advice and complete healthcare facilitation to patients globally.

Article Source:http://www.articlesbase.com/vision-articles/lasik-surgery-the-perfect-solution-for-a-perfect-vision-1310582.html

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