LASIK is far from perfect in some aspects, although many people especially those professional sports individuals strongly recommend the surgery. Most people have emphasized on advantageous sides of LASIK surgery but ignored its shortcomings.

It is hard to make a comparison between the total costs of eyeglasses or contact lenses during years long and the expense of LASIK at one time. But one point is true that eyeglasses or contact lenses do better in adjusting to prescription changes. People with visual defects can always get a pair of eyewear with proper prescription if enough test and fitting are made. As a person ages, the prescription is much likely to experience slight changes. Wearing eyeglasses or contact lenses, it is easy for the wearer to get a more precise prescription.

When it comes to LASIK procedure, these prescription changes are hard to be adjusted. The basic principle of LASIK surgery is that the corneal surface is reshaped using a laser so that its curvature will be changed. In this way, refractive errors can be corrected. However, the laser application involves tissue removal on the cornea, which is irreversible and always permanent. There is hardly a remedy once a patient is unsatisfied with the visual outcomes. A more disappointing fact is that patients are usually required to sign away their right to a lawsuit before the procedure.

Another shortcoming of LASIK is that it can not restore flexibility of one’s natural lens. As people age, eye flexibility decrease is inevitable. This means that one’s focus range will be narrowed. For contact lenses or eyeglasses, bifocal or multifocal lenses are widely used to provide vision correction at several distances, enabling wearers to see at a wider range. LASIK can always offer vision correction at only one distance.

Except for those shortcomings, LASIK as well as other laser eye surgeries also involves some risks. LASIK will thin the corneas, which are more vulnerable to shock or pressure. This is testified by the rule that military services of the USA are prohibited from receiving laser eye surgery.

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Since there are many aspects that should be assessed, it is can hardly be easy to get an appropriate pair of eyeglasses. Two most basic aspects are eyeglass frame and lenses. Evaluating eyeglass lenses, there are lens materials, visual correction type, lens thickness as well as other factors. When it comes to cosmetic spectacles, it is always still necessary to a choose lens color. Furthermore, some opticians or eye care practitioners would recommend special lens coatings such as anti-reflective coating, scratch-resistant coating and so on. With detailed explanation by the doctor, the final decision often depends on the customer. The other part of a pair of eyeglasses is the frame. Actually, eyeglasses frames also have different types. Frame materials such as metal and plastic can divide those frames into main categories. And in a further step, there can be several variations within each main category. Eyeglasses frames can also be grouped depending on structural differences. For instance, there are frames with integrated nose pads and the others with flexible or adjustable nose pads.

Those are not all the ways to classify eyeglass frames. People with certain experience of choosing eyeglasses would know that there are different eyeglass frame shapes. But most of them may have only known the obvious differences between large frames and those small ones. In some cases, more experienced eyeglass users may have heard of eyeglasses frames shapes such as round and rectangular. In fact, the shapes of eyeglass frames are designed according to basic face shapes of human beings. In general, there are mainly six types of face shapes, namely, round, oval, oblong, square, base-down triangle and base-up triangle. Face shapes of most individuals can be fitted into one of these basic six types. In fact, these basic face shapes are listed by many online eyewear stores. They provide model images for customers to try on their favorite eyeglasses virtually.

Choosing eyeglasses frames should necessarily take personal face shape into account. A complementary pair of eyeglasses will enhance the natural beauty of the wear’s face. In an opposite case, disappointing effects may occur. Round and oval faces usually have few angles, so that a rectangular shaped frame is preferable. People with either round or oval face shape are encouraged to wear eyeglasses that can make their faces thinner and longer. Dissimilarly, oblong and square faces will comply with round-like eyeglass frames. Those obvious face angles should never be enhanced. The last two face shapes including base-down and base-up triangles also require specific frames. In general, base-down faces need a frame adding width to the upper face, and base-up faces require frames wider at the bottom.

Firmoo.com is the emerging online eyeglasses store selling high quality eyewear, such as prescription eyeglasses (single vision myopic glasses, reading glasses, bifocal and progressive eyeglasses etc.,), prescription sunglasses (with RX tinted lenses), prescription sports goggles. Firmoo guarantees lowest possible price in the market. Firmoo’s return and refund policy makes any purchase risk-free ones.

Article Source:http://www.articlesbase.com/vision-articles/shapes-of-eyeglasses-frames-1777314.html