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Astigmatism is a refraction of the eye is not normal conditions, related to the curvature of the cornea. The human eye is not perfect, if the cornea more curved in a certain angle in radians, while others relatively flat angle, the light will not be accurately focused on the retina, in which case it is called astigmatism.

Ordinary glasses can correct rule astigmatism:

Ordinary glasses can correct rule astigmatism, irregular astigmatism can not use it to correct, and the best way is the use of rigid contact lenses to correct, to good effect. Ordinary lens correction rule astigmatism effect is not the same, the greater the degree of astigmatism worse the effect of mild to moderate astigmatism can generally be corrected to normal, and a high degree of astigmatism correction is more difficult to good effect.

The astigmatic not is corrected will develop into moderate myopically:

High hypertrophy, astigmatism, far and near vision can not see the objects dependent regulation if not corrected as soon as possible, the development of visual function in early childhood will be some inhibition, grew up with Fake Oakleys glasses before until corrected visual acuity worse tend to form moderate myopically. Highly myopic astigmatism, although the look is far from clear, but near vision is also better visual function may also get some exercise is not completely suppressed, corrected visual acuity is generally better than the highly hypertrophy astigmatism. Whatever high astigmatism, corrected the sooner the better. Because the error corrected early, not only to promote the development of visual function, and deformation of objects and spatial orientation reaction to a small degree, the patient can withstand.

Astigmatism prescription glasses according to the following principles to give:

General hyperopic astigmatism less than +0.5 D, 90-degree axial myopia and astigmatism less than-0.5D axial at 180 degrees (the cornea by the oppression of the upper and lower eyelids, the degree of curvature of the cornea to the vertical direction than the horizontal radial the vertical radial refractive power, horizontal weak refraction) generally do not affect vision, can not correction; visual fatigue or affect vision, astigmatism should be corrected to the mirror.

Premise eliminate symptoms or do not affect vision, astigmatism should be low corrosively particularly high degree of astigmatism, astigmatic axis tilt in the direction, should be low corrosively, found that the shape of the object or to see things due to the full correction patients changes and the size of this case, hypertrophy astigmatism change than myopic astigmatism.

Within 3.00D axis myopic astigmatism, adolescents and isotropic should be given to correct. The individual oblique axis with different axis based on the ability to adapt appropriate by many more. Than 3.00D axis hypertrophy astigmatism, Fake Oakley Sunglasses, juveniles and isotropic who should be appropriately reduced by 0.50 ~ 1.00D; the individual oblique axis or hard-axis recipients, should be cut some, wearing glasses after 3 to 6 months in increase should be cut more hypertrophy astigmatism. Oblique axis, different axis degrees on the high, although the degree of reduction trials of patients, the symptoms are mild, but the prescription should be talking to customers to understand the phenomenon of deformation of objects and spatial error will undergo wear, wearing some time 'all adapt.

Under normal circumstances, if the spherical 1.00 ~ 3.00D, astigmatism 0.25 ~ 0.50D; spherical 3.25 ~ 6.00D, astigmatism 0.50D; spherical 6.25 to 8.00D, astigmatism 0.75D; ball 10.00D more astigmatism 1.00D column-plus vision to promote small and ignore the fatigue, you can not mirror column; appropriate given a certain degree of the cylinder, where the column more than value. Some patients with poor sensitivity can be difficult to distinguish Axial given close to the axial shaft. In summary astigmatism of the mirror: mild astigmatism, asymptomatic without astigmatism, have symptoms should wear full correction of astigmatism increase; highly astigmatism, wearing glasses for the first time to be appropriate, to reduce the glasses, to be then used to completely corrected; 2.00D following a simple astigmatism can be fully corrected, 2.00D more simple astigmatism can be divided into secondary correction; complex astigmatism where spherical in 3.00D cylinder 0.50D or less spherical in 6.00 above D, astigmatism 0.75D or more, or spherical in more than 10.00D cylinder 1.00D, where vision enhance required plus astigmatism correction.

If a patient is first wearing Replica Oakley Sunglasses, and high degree of astigmatism, if not meet, according to the ball column equivalents rules to reduce astigmatism, the so-called ball column equivalents rules: add 1/4 of the original column diapers spherical As a new spherical, 1/2 of the original column diapers constant as the axial direction of the rod lens. Example:-1.00DS to-6.00DC of * 90d, patients wear discomfort, the ball column equivalent of rules can be used to do the following changes:-2.50DS to-3.00DC * 90d.

How to choose glasses?
How to choose glasses optometry it? Glasses purchase of appropriate or not directly affect the comfort of the eye, or there will be adverse reactions. Some so-so to elect a cheap, or savings point of view, the use of someone else's glasses frame; some people talk about fashion the frames bigger and more beautiful. These cases are caused by glasses often not comfortable.

Wear Replica Oakley Sunglasses can make people look educated and gentlemanly, selection of glasses should not only pay attention to the style of the beautiful, but also can not forget the glasses with correction of refractive errors and the role of health care, we must put quality first. The glasses also the refractive media, to wear to the eyes, to have a beneficial effect on the refractive system must be eye, only to meet the refractive state of the eye glasses eye to beneficial.

Also, pay attention to the quality of the glasses. First diaper error must be within the standard range, generally no more than plus or minus 0.1D; second, binocular lens optical center distance and pupil distance consistent, not one high and one low; addition optometry measuring instruments must be detected qualified, the density of the lens to be uniform. The failure of the glasses do not use, even if the exchange is being used. In short, the correct selection of glasses should be co-ordinate from all aspects of optical lenses, aesthetics and mechanics consideration. Frames should pay attention to the mirror beam frames and nose, temples and ears-anatomizes, the weight of the glasses evenly distributed in the nose and ear, not too tight and not too loose, not to a high a low, so that the frame is fixed and held in the correct position, so that wear only comfort.

How to give the child chosen frames?

Many children in the optometry process can not be a good match, doctors have to spend a lot of effort in order to complete the of optometry checks and frame measurements, sometimes doctors can only observe the child's nose characterized to determine whether the temporal distance is not proportional to the IPD. This is to encourage children to choose their own favorite color, to seek the views of the child as much as possible, and then according to the measure of the bridge of the nose, the papillary distance discusses with parents glasses. The frames must pick the right. IPD is too small; the effect is opposite to the above case. Two lens optical center is not a horizontal line will be generated when the bottom upward, downward prism effect. Especially young children, can not speak, parents often mistaken for naughty children loved glasses. Sustained so bad to wear eye position, and so must be taken seriously, can not make the child emotional aversion to wearing glasses. Pediatric patients, aged only 2 - 5 years old, but also not very sensible to offer more encouragement. School-age children, 6-8 years old, they understand the importance of wearing glasses, will be a very good fit. Children's spectacle frames need to select the frame nose pads should be low, because the development of children's nasal yet full, not with adults. Rapid changes due to the growth process, using the annual pounds milliseconds characteristics to be hanging ears, it's the end of the buckle like a vertical direction, penetrates through the end of the elastic band, and then around the button in the young children on the back of the head. The tied straps should not be too loose, side Fake Oakley Sunglasses from a child's head slid down.

School-age children in the style and color of the glasses frame more children choose eyeglass frames also attach great importance to their pursuit of beauty as much as adults. Glasses for children, however, must proceed from reality, the majority of children are naughty fun, the lens shattered eye injury things often occur. Therefore, the best choice of lenses resins piece frame plastic frame affixed to the face and nose fit. Not suitable for children wearing metal frame, metal frame nose pads easily cause allergies and nasal pressure. Metal frame nose pads adjust inaccurate, nasal pressure phenomenon is even more serious.

Crystal glasses can keep eyes?

Crystal glasses can support the purpose of saying ancient spread so far. Ancient science developed, there is no better than the crystal material produced glasses, and the price is very expensive, only nobles to wear. So that it is very expensive and it is amazing, wearing the effectiveness of rising purposes. So far, a lot of people have not changed this ancient view. In fact, this is more than understand the crystal structure; crystal glasses do not know can not keep the purpose of truth. Crystal is a natural ore, uneven density, texture very different, limited production, and firm in texture, processing difficult and time-consuming and labor. Brown crystal with color, reducing the ultraviolet ray transmittance, but can not absorb infrared. Crystal stone often wispy streaks with tiny bubbles gather, into translucent (commonly known as the cotton fields), impede vision. This shows Fake Oakleys glasses and not raising projects.

1, high myopia above (-6.00ds)

Completely corrected initial glasses, such as significant adverse reactions, you can start by 2/3 of the diaper with Fake Oakley Sunglasses With the reduction of the adverse reactions gradually achieve satisfactory correction after 3 months. Sometimes incremental degrees to fully correct up to 3 times, each time raising the general-3.00D or less, this is because the culinary muscle to restore normal regulation requires a process of adaptation. Had worn high myopia patients, it is also likely to increase once the diaper can achieve satisfactory vision correction.

In fact, the elderly long as they can meet the needs of daily life, the degree glasses may be appropriate to lower both so far but also nearly with. For example, 60-year-old customer-12.00ds real with-9.00ds, such as distance vision corrected to 0.8 near normal, no adverse reactions. As for the Pd take far, the near Pd of the average, only choose the far or near to take corresponding Pd. For Students should strive to be completely corrected. Take the hole mirror on corrective lenses when is difficult to judge whether the vision correction can further increase if the vision does not improve, the judge corrected visual acuity stop here. To do so, will help speed up the appropriate choice of diaper lens.

2, high hypertrophy (+5.00 ads)

Phonic: unusually active due to the adjustment of children eye is still required in the preliminary optometry dilated or cloud method to ease the adjustment to be pupil returned to normal (with compound tropic amide in the first two days, with atropine After one week, three weeks after atropine) and then line optometry, and then comparing the before and after dilation diaper prescription. The general prescription on refractive located between before and after dilation refraction, because it is necessary to exclude regulating intense interference, but also consider the daily objective existence of the remaining adjustment. The dominant hypertrophy degree +1 / 4 recessive hypertrophy degree as the degree glasses, or take 2/3, the day after dilation diaper, but are not as good as the former method is accurate and reliable. Cloud method to ease the adjustment, can be determined on the day the prescription, but not as good as the dilated effect. As ever with Replica Oakley Sunglasses can be suited to a marginal decrease in the degree mirror, mirror degrees to gradually increase in the short term fully corrected to prevent isotropic and myopically occurs. For youth and adults, due to adjust gradually reduce, without cyclopedia refraction, the cloud method when necessary, take the highest degree of normal vision or better vision.

Aphasia: common in the cataract lens extraction in patients with general admission +10.00 ads (+11.00 ads) plus half of the original diaper glasses degrees. For example, a patient in the lens removed before the myopia-2.00ds can try to take; original +2.00 ads, try to take or.

3, anisotropic significantly

Carleton and Mandy anisotropic due to the size of the image on the retina to produce 5% of the difference between the maximum limit for two melt like. Usually advocate the use of an ordinary lens correction of anisotropic, Fake Oakleys on both sides of the lens degree difference can not exceed 2.00d, which has become a routine can do of course, very good. Found 100 cases of anisotropic patients, two diaper difference 4.00d often full correction video more than 3%; diaper difference 4.00 ~ 5.00d, most can be corrected video usually difficult to correct in the 3 to 4%; diaper difference in 5 ~ 6d, the critical value is accepted and not accepted, should strive the full corrected video than 4 to 5%, diaper difference in more than 6d , and more than the loss of stereo sis, the mulch video more than 5%, should be an appropriate part of the correction. The author has provided patients with two glasses diaper difference 6.00d above, there is no adverse reaction. Example 1, the 42-year-old male patient, uncorrected visual acuity right 0.1, left 0.25 glasses right-13.00ds-2.00dc → 0.4, the left-2.5ds-0.5dc → 1.0; Example 2, a 30-year-old male The right of patients, uncorrected visual acuity of 2.0, left 0.1 glasses right Pinging, left +9.00 the ads +2.00 dc × 163 → 0.8. The cases two diaper difference in 10d above, but it feels good, and can prevent the deterioration of the waste with myopically tendency. Seen great individual differences in the ability to adapt to the spectacle-corrected, especially age-related, it may be because the main eye play the sake of visual function advantages.

A lot of people in life, almost always and the glasses became involved. The experts remind therefore, currently optometry workers most basic to the most commonly used, but one of the important works. Patients with poor vision need glasses to formal institutions optometry must be noted that it may not know, in fact, the day different time, optometry; the result is not the same.

When optometry best results?

Day morning refraction effect is usually the best.

Optometrists and Fake Oakley Sunglasses the best selection in the morning, this is because the eye is far and near different objects, primarily depends on contraction and relaxation of the culinary muscle, lens thickness in stretch to adjust the focal length. Eyes enough rest after a night of culinary muscle available completely relaxed the most accurate results of optometry.

If the election in the afternoon or evening, the eyes after a day of use, especially in some children a holiday after a long time sitting in front of a computer screen playing games, culinary muscle in a state of fatigue, then glasses, optometry results may be too high. Wearing such glasses might not feel any discomfort, but two or three days, dizziness, dry eyes and other symptoms may occur.

Hindus examination before the glasses is very important

Decreased vision, see things, not simply a problem of myopia, is likely to be the funds went wrong, and who have this condition, should go to the Eye Hospital for treatment. With Replica Oakley Sunglasses passed before the eyes of the inspection can prevent accidents from happening, while screening out cyclopedia refraction.

Disable contact lenses before optometry

The computer optometry commonly used method, which uses the optical focus measured specific degree. But the mechanical read the data, and does not take into account the subjective feelings of the human eye, with glasses, do not rush to go with good glasses, try them for some time, was not to hurry to leave, if you feel unwell to re-optometry. Experienced optometrist will take full account of the status of the customer's eyes, give a reasonable prescription. Therefore, it is best to professional organizations with Fake Oakleys glasses.