Posts Tagged ‘pupil size’

Vision improvement through eye exercises

In general, the eye’s focus and pupil size are under control of the internal muscles, while external muscles have more responsibilities. External muscles direct the eyes to the right point and keep the retinal image in constant slight motion. In fact, both internal and external muscles are quite important in maintaining good eye health.

Like any other muscle system, eye muscles are subject to fatigue after continuously use without breaks. They can be fatigued if the eyes are used for prolonged ocular activity. In addition, those activities that require added effort and concentration can cause eye fatigue more easily. After proper rest, eye muscles can recover their optimal levels of function.

Eye muscles do need proper rest and relaxation, similar to other muscles of the body. Excessive eye use can push eye muscles to their limit, which can lead to vision problems. This abuse of the eye prevents eye muscles from restoring to their normal state.

Experts have suggested that eye muscles can benefit from exercises, just like the body. A New York ophthalmologist named Dr. William Bates had developed a series of eye exercises for vision improvement, which can eliminate eyeglasses, contact lenses and surgery.

Dr. Bates thought that people with poor vision can benefit from those exercises, without the help of eyewear and vision surgery. In his mind, eye problems were caused by eye stress, tension as well as laziness. Eyeglasses and contact lenses could actually increase the laziness of the eyes. In fact, those methods initiated by Dr. Bates were first introduced in the early 1900s. And until now, many people have been taking these proven methods.

Eye muscles fixed on one particular scene has been believed to cause strain to the eyes. In this consideration, it is quite reasonable that eye relaxation can provide an improvement between the optic nerve and brain, which brings clear vision.

Remarkable visual improvements have been reported on all groups, such as those are nearsighted, farsighted, astigmatic as well as people with lazy eyes. Dr. Bates’ exercises have proven to be effective, although medicine has simply ignored the exercises’ benefits.

Palming, swinging and daily color awareness are some of the Dr. Bates’ exercises, most of which should be performed for about 30 minutes every day.

reference

·Be careful of vision-improving eye exercise programs

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Article Source:http://www.articlesbase.com/vision-articles/vision-improvement-through-eye-exercises-1596291.html

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Tunnel of Vision now better defined with new technology by Neuroptics

The Neuroptics pupillometer is a state of the art device used to measure the size of the pupil in real life conditions.  We acquired this technology in relation to a new FDA study that is beginning soon at Dishler Laser Institute.  In learning about this device we are so impressed that we have decided to use it for all of our LASIK evaluations to measure the pupil of the eye prior to surgery.  This device uses infrared light to measure the pupil 39 times per second for two seconds and then averages these readings to give an average pupil size which is accurate to 0.1 mm with a digital readout.  The human pupil is never stationary and constantly is changing in size depending on lighting conditions.  Even when the light level is constant, there are pupil fluctuations known as hippus.  We are not so concerned with pupil size in bright light, but in dim light a large pupil can potentially cause issues if not considered prior to LASIK surgery.  We measure the pupil in a controlled dimly lit room with the patient focused on a distant object.  This is because near vision targets can also make the pupil contract, similar to the effects of  bright light, and thus give an artificially small reading of pupil size.

We have learned in LASIK that there is not a direct correlation between pupil size and night vision complaints.  There is also not a direct correlation between pupil size and the size of the treatment performed during LASIK or PRK.  That being said, there is some relationship between pupil size and the treatment plan which makes accurate measurement of the pupil important.  While many laser centers still “guesstimate” the pupil size, and others use the Colvard pupillometer, very few have this advanced technology.  What is so interesting is that real vision is related to the size of the pupil averaged over a few seconds, since the pupil is constantly in slight motion.  Only the Neuroptics device can accurately measure the real pupil size in such an accurate manner.  Another factor that confounds this measurement is called vertex distance.  Basically this means that deep set eyes can be artificially measured differently than prominent ones.  The Neuroptics device measures the true pupil size.  In fact the Neuroptics can measure the pupil in total darkness for the largest size estimation when needed.

While the average patient is not really interested in the details of this particular test, what should be apparent is that the Dishler Institute, is really that, an institute of vision technology.  More importantly we bring the latest in technology to our patients as we have for the last 25 years.  This is only one test of many using the most advanced technology which gives our team of professionals the information that we need to best evaluate your eyes and vision and help you to make a determination as to whether LASIK or PRK or an ICL or maybe no surgery is the best choice for your eyes.  There is no reason not to take us up on our offer for a complimentary consultation and have your pupils measured with the Neuroptics Pupillometer, along with many other noninvasive tests done to evaluate your unique eyes and their properties.

We begin with advanced knowledge and technology to evaluate our patients.  The Neuroptics device is one new step in the path down the tunnel of light that we call vision.

Dr. Dishler is the first doctor to perform LASIK in Colorado, the first doctor to offer blade free LASIK in Colorado, and is a consultant, lecturer, and inventor. He is involved with several FDA studies and answers questions related to laser vision correction online.

Article Source:http://www.articlesbase.com/vision-articles/tunnel-of-vision-now-better-defined-with-new-technology-by-neuroptics-1539523.html

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Get a 20/20 Vision with Lasik Eye Surgery Procedure

You could have come across eye centers touting outrageous offers of’20/20 vision or your money back’. The whole idea of 20/20 vision has been ballyhooed immensely when it comes to Eye Laser Surgery. Basically, the value 20/20 makes reference to a technique of measuring visual acuity thru the Snellen eye chart ? The same old alphabet chart that you may have seen at a nearby eye care center.
With the newest technical advancements in laser eye surgery, the conventional Lasik Eye Surgery Procedure has been enlarged with superlative techniques like wavefront LASIK, and its add-on, iris registration. With such enhancements there’s an even larger chance of 20/20 vision relative to that with conventional LASIK. By using wavefront technology there’s a great, around 95%, chance of 20/20 vision. However [*COMMA] with the iris registration technology, the chance of 20/20 vision skyrockets to an overpowering 99%.
20/20 vision is what you shoot for while undergoing any sort of refractive surgery ? It’s used as a benchmark. However, some folk hold a somewhat dissenting opinion about 20/20 vision, so far as laser eye surgery is concerned. The argument put forth is that visible quality matters more than visible acuity. As is obvious from a number of cases, Eye Laser Surgery, for example LASIK, have potential issues. A patient might experience blurry vision, halos, spook vision or double vision, glare, and starbursts surrounding light sources at night.
Normal vision is crisp and pointy. But after Eye Laser Surgery, someone might have to handle enfeebling side-effects, which sometimes diminish vision quality. Though the patient might still be in a position to decipher a 20/20 line on the Snellen chart, the vision might be blurry.

In general, the degree of refractive error and the pupil size are the only criteria while determining the candidature of a patient for Eye Laser Surgery. The information important to such aspects is reasonably anecdotal.
If you find a LASIK surgery that you are confident with, you will be able to get additional information about 20/20 vision.

“Other sites worth checking out”

Fletcher has been writing articles online for a few years now. Not only does this author specialize in diet, fitness and weight loss, you can also check out his latest website on Eye Laser Surgery which reviews and lists the best Lasik Eye Surgery Cost for your eye care.

Article Source:http://www.articlesbase.com/vision-articles/get-a-2020-vision-with-lasik-eye-surgery-procedure-1270169.html

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The Aging Eye

Vision changes

With aging, the quality of vision worsens due to reasons independent of aging eye diseases. The area of the pupil governs the amount of light that can reach the retina. The extent to which the pupil dilates also decreases with age. Because of the smaller pupil size, older eyes receive much less light at the retina. In comparison to younger people, it is as though older persons were wearing medium-density sunglasses in bright light and extremely dark glasses in dim light.

To maximize the light entering the eye, make sure that your eye glasses have anti-reflective coating. Anti-reflective lens coatings significantly reduce surface reflectance and allow greater light transmission through the lens. When AR coating is applied to both the front and back surfaces of a lens, the percentage of transmitted light increases to approximately 99% (compared to 90-92% with non-ARC lenses).

Aging causes a dramatic slowing in dark adaptation. Color vision changes cause some reduction of ability to discriminate blues and blue-greens. The yellowing of the lens is believed to be responsible for this effect. The aging lens and cornea causes glare by light scattering, especially for shorter wavelengths. Aberrations of cornea also increase with age, leading to poor vision especially when the pupil dilates as in the dark.

The most aggravating aspect of vision in an older person seems to be the feeling that it does not work as effortlessly or as quickly as it did in younger days. They must concentrate harder and require higher levels of illumination than they formerly did in order to have the same perceptual results.

Lighting the way

Everyone’s vision deteriorates with age, but there are ways to lessen its impact. Good lighting can make the difference between seeing and not seeing for older adults, especially in your homes, stairways, kitchen, living rooms etc. Naked bulbs: These are worst for older eyes, producing a glare that can be disorienting and painful. Task lighting: Light should be focused on the work, not toward the eyes. A good choice is a CFL with electronic ballast that starts up without flickering. Bathroom lighting: Lots of light should be provided overhead and even in the shower, where accidents are particularly common.

Anatomic changes

Aging causes laxity and downward shift of eyelid tissues and atrophy of the orbital fat. These changes contribute to the etiology of several eyelid disorders such as ectropion, entropion, dermatochalasis, and ptosis. The higher eyelid skin crease and ptosis may be due to age related disinsertion of the levator muscle aponeurosis, and to involutional atrophy of the orbital fat. The horizontal eyelid fissure shortens by about 10% with aging. With aging a prominent white ring develops in the periphery of the cornea- called arcus senilis. The corneal endothelial cells gradually decrease in number. The vitreous gel undergoes liquefaction and its opacities – visible as floaters gradually increase in number.

Aging Eye Diseases

Cataract: Cataract (‘safed motia’) is a clouding or opacity of the normally transparent lens inside the eye. It prevents the light rays passing onto the retina. The picture that the retina receives becomes dull and fuzzy. The normal process of aging causes the lens to harden and become cloudy (opaque). This is called age-related cataract and it is the most common type. It can occur anytime after the age of 45 years.

Glaucoma: Glaucoma (kala-motia, kala-paani) is a serious condition that involves an elevation in pressure inside the eye caused by a build-up of excess fluid. Left untreated, this pressure can impair vision by causing irreversible damage to the optic nerve and, eventually, blindness.

Macular Degeneration (ARMD): The macula is the part of the retina, which provides us with central vision and allows us to see fine detail, such as recognizing a face, reading, or watching television. Macular Degeneration is a condition in which the macula gets damaged. It is often related to aging, and is commonly referred to as Age-related Macular Degeneration (AMD).

Presbyopia: If you have presbyopia, you have the loss of the ability to focus up close that occurs as you age. Most people are between 40 and 50 years when they realize for the first time that they can’t read objects close to them.

Macular Hole: A macular hole is a small break in the macula, located in the center of the eye’s light-sensitive tissue called the retina. A macular hole can cause blurred and distorted central vision. Macular holes are related to aging and usually occur in people over age 60. It is 4 times more common in females.

Diabetic Eye Disease: Retinopathy is usually due to damage to vessels in retina. Retinopathy is usually caused by Diabetes (DM), but is sometimes caused by other diseases such as high BP.

Dry Eye: The most common cause of dry eye is a failure of the glands in your eyelids to produce tears, which often occurs as part of the ageing process.

The real problem of blindness is not the loss of eyesight. The real problem is the misunderstanding and lack of information that exist. If a blind person has proper training and opportunity, blindness can be reduced to a physical nuisance.

www.eyeclinicindia.com

(ArticlesBase ID #1185259)
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