Posts Tagged ‘Circle Contact Lenses’
January 6th, 2012 | 
Author: Glasses inconvenience brought to CONTACT LENSES correction development, and not only from plastic which can be worn under the eyelid, directly on the ocular eye. These CONTACT LENSES minimize radically the breaking risk, which is always present at normal glasses, because the contact lens is being protected by its shape, as the eye by skull shape. Nowadays lenses cover only the eyes cornea. So called soft CONTACT LENSES are used frequently and they are formed from a soft plastic, which casts on the eye.
Contact Lens History
The first lenses are from the time of Greeks and Romans, where glass spheres were filled with water. Those lenses filled with water were used as glasses with fire. The real glasses didn’t appeared in classic times; they were manufactured for the first time at the end of the 13th century, in Europe. The process of lenses fabrication didn’t changed too much since the Middle Ages, beside the utilization of grinding degree, introduced by Isaac Newton.
The recent developments of plastic and special processes for modulate them, brought to the increase of lenses production. Plastic lenses are easier, cheaper and less fragile then the ones from glass.
In 1286, the Englishman Roger Bacon registered a declaration about optic lenses utilization. Glasses were first used in Italy, Europe. Starting with the 15th century, the request for glasses increased so that in 1629 had become a real business.
The first pair of bifocal glasses was made by Benjamin Franklin in 1760.
Lenses are used in optical systems from glass or any other transparent substance, with a form that allows refracting the light of any object of real or virtual shape and lenses from glasses are used in medical purposes.
Lenses are also used at microscopes, telescopes and other optical tools.
Lenses producing
In most cases, lenses are formed from a kind of superior quality glass. This is called also optical glass, which has no internal defects, air bubbles or other flaws. The process of making a lens from a glass block implies a few operations. The first step is tracing a shape of lens on the glass block. After its cut, it’s pressed with a piece of thin metal, whose edges are strewed with diamante powder.
The piece of glass it’s brought to its shape by cutting it with an iron plate covered with a mixture of water and adhesives.
For obtaining the lens surface are used concaves or convexes tools, loaded with abrasives.
The finishing process of the lens is the grinding, and after that, the last thing is to cut from the edges, so that they will be equal.
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There are contact lenses of various types. However, some people can not wear certain ones due to their special eye conditions. Usually, which ones are to wear will be decided by the eye doctors who have a much better idea about this. Different lenses vary a lot in materials, duration, transparency and functionality.
If judged from materials, contact lenses can be fallen into two groups, say, soft lenses and hard lenses. The former type is gas permeable and can maintain sufficient moisture. The moisture in it also varies a lot. On the contrary, the later type is made from durable materials and can let gas through as well.
Of course, different lenses can be worn for different duration. Such as, the hard series can be worn for several months if maintained and cleaned properly. On the contrary, the soft series can be worn for much shorter time- some of them must be replaced daily,
weekly or monthly. Or there are still some lenses that can be slept in at night, which are still in need of careful maintenance.
Usually, lenses can be designed in three major forms, namely, toric, spherical and multi-focal. Each of them is suitable for wearers with particular vision problems. Such as, toric is used for astigmatism correction; spherical lenses is for short or long sightedness; multi-focal for presbyopia. Therefore, people should consult with their eye doctors before deciding which ones to buy.
The reason why people use lenses varies a lot, including optical, therapeutic, cosmetic and decorative purposes. If people have some vision problems to be rectified, optical lenses are ideal. If people are receiving medical therapy, therapeutic lenses are suitable. If people want to change their eye color, cosmetic lenses can be used. As for decorative lenses, they are mainly used for fun and entertainment. Therefore, people should consult with their eye doctors if they really want to wear lenses, so as to avoid mistakes, which may lead to serious eye damage.
In a word, people are strongly suggested to consult with their eye doctors in determining which lenses to buy, according to their personal needs. In addition, it is urgent to know something more if they really want to wear lenses.
Posted in Best advice, contact lenses, Eye Care, good advices, Tips | 
Tags: Circle Contact Lenses, Eye Care, Lens Problems, Optical Glass | 
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Instead of a automated microkeratome, a laser creates the accessory during the intralasik or intralase which is allotment of the laser eye analysis procedure. To accurately accomplish a band of bubbles just beneath the cornea which is amid in foreground of the eye, a computer guides the fematosecond laser. The basal stromal band is appear through a accessory bald from the eye, a action created by bubbles that overlap.
The antecedent screening tests specify the ambit acclimated in the arrangement of the fematosecond laser. The alpha action involves barometer the refraction or comedy decree and cornea array and topography. This action is akin with approved lasik, throughout which the accessory is created. To assistant the eye, the accessory is placed, authoritative healing achievable afterwards the use of stitches.
Intralase and accepted lasik eye anaplasty requires the aforementioned column operation treatment. Over the advance of the approaching weeks, lubricants and antibacterial eye drops are acclimated to amusement the eye, authoritative it cure added rapidly. Eye afterimage aberration is to be accepted over the consecutive weeks to one month, admitting eyes afterward the day of the action is bigger than the preoperative one.
Complications afterwards operation are additionally agnate to approved lasik surgery. For example, some appear to accept suffered from abiding dry eye, acute all-day lubricants and brief gels. However, this activity has been appear to abatement aural six months of the operation. On evenings, blaze and haloes appear as well. Night time activities such as active become alarming due to this, as able-bodied as simple activities like watching sports live.
LASIK represents the appellation ‘laser-assisted in situ keratomileiusis.’ This is a blazon of refractive anaplasty for acclimation myopia, amaurosis and hyperopia. In LASIK eye surgery, appropriate brash laser is acclimated to improve, abate or annihilate the use of cutting glasses or acquaintance lens.
Prior to the LASIK eye surgery, patients are accustomed postoperative care. This agency that they are accustomed a advance of antibacterial and anti-inflammatory eye drops afore and afterwards the surgery. They are aswell brash to accept added beddy-bye abnormally afterwards the eye anaplasty to access the amount of healing. To assure the naked eyes afterwards the surgery, patients are again offered blurred brace of goggles to assure them from the sun and at the aforementioned time, abstain any abrading on the eyes. They accept to aswell accomplish abiding that the eyes are accustomed preservative-free drops to ensure that the eyes are aswell moisturized.
LASIK eye anaplasty offers a advanced ambit of advantages such as getting able to abating amaurosis or near-sightedness, anticipation and even astigmatism. Such surgeries are actual absolute and the after-effects are authentic as the laser is guided by a computer. With this, the backbone can ensure a top adventitious of success afterward this eye anaplasty if all the procedures are followed closely.
Before traveling for such surgery, patients are brash to accept the affair they are adverse and be able behindhand of the outcome. Future patients who are ability LASIK eye anaplasty should aswell accept a close compassionate on the accomplished action to ensure that they are able-bodied acquainted of what they are ambidextrous with. Choosing the appropriate surgeon is aswell a astute accommodation as a surgeon’s accomplishment ability affect the adventitious of success for such operations.