Prescription eye glasses are used for vision correction as the combination of the lenses in your eyes and the lenses in your glasses will allow you to see properly. Those that have an astigmatism, are nearsighted or farsighted will require prescription eyeglasses. If you are nearsighted then you cannot see clearly far away and if you are farsighted then you cannot see clearly up close. As people age they may become both farsighted and nearsighted. In order to purchase prescription eyeglasses you will need to have an eye exam performed by an optometrist and then receive a prescription.
For those that have severe vision problems eyeglasses with lenses made of high index material can be the best as high index material eyeglasses will be very lightweight and provide better optics. Many times those with very bad eyesight will get headaches because their glasses are very heavy. High index lenses are an excellent option.
Aspheric lenses are also an excellent option for those that have very bad eyesight. Unlike more traditional lenses, aspheric lenses are more flat and thinner. This can be a benefit for your appearance as the lenses will not distort your face. Many times individuals that have extreme sight correction will have glasses that magnify their eyes or minify their eyes. With aspheric lenses your appearance will not be distorted.
There are also several types of coatings that can be applied to your lenses. Almost all prescription eyeglasses come with scratch resistant coatings. This coating makes any non glass lenses as scratch resistant as glass. There are anti reflective coatings to reduce glare, UV coatings to protect your eyes from UV light and other coatings that can make your eyeglasses last longer and look better.
Prescription eyeglasses can also have tinted lenses and the newest types of tinted lenses are photochromatic. Photochromatic lenses change color depending on the amount and type of light. When you are indoors the lenses will appear clear but if you should go outside on a bright sunny day the lenses will darken. Lenses can also be tinted strictly for aesthetic purposes.
Multifocal lenses are used for those that suffer from nearsightedness and farsightedness. The most common multifocal lenses are bifocals but you can also get trifocals and progressive lenses. Trifocals have three different lenses and progressive lenses have a smooth transition between the different lenses so that there is no line.
Some new developments include sunglasses with scratch resistance and smudge resistance. These sunglasses with Scotchgard protector reduce dirt, smudges, grease and water from adhering to the glasses. Progressive lenses now have an intermediate range instead of rather abruptly switching form one lens to the next.
Progressive lenses have developed further so that the transition between lenses is even smoother and less sudden. New forms of eyeglasses have been developed to reduce dry eyes and eye strain. By using wave front measurement prescription eyeglasses can be made to not only correct vision issues but also other high order eye problems.
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