A lens could be multifocal by which is meant that it can be used for correcting visual defects for varying distances. These could bifocals, trifocals or even special lenses for special services.
Why Multifocal Lenses?
There are a lot of people who cannot see very well at all distances. Bifocals are lenses meant for both near and far visions. Trifocals are of course useful for both near and far and even middle distances. For people who reach middle age, vision gets limited to only certain distances. Multifocal lenses come into play to correct these wrongs and this is why they are used.
Aging of course naturally lead to many of these eye ailments. Multifocal lenses help correct several of these defects. In the United Stets of America almost half the lenses. These are useful statistics to consider.
The gradual decrease in the ability of the eyes to focus is a natural part of the aging process. Mulitfocal lenses correct for these naturally generated errors in vision. Currently, over half of all lenses worn in the U.S. are multifocal.
Who needs Multifocal Lenses?
Well definitely not old people only. These lenses are used by both old and young widely. Children, adults and teens are all fond of these lenses and the lenses are corrective of everybody’s vision defects. Even a young person’s vision might be alright but he/she still might need readjustments to see well.
What are Trifocals?
Glasses are divided into three sections and trifocals entail that you take a corrective for immediate vision too. The close, the far off and the intermediate vision all of these need correctives if you are using a trifocal lens. Near the bottom of the lenses you can have a semicircle which handles your middle and near perceptions. Presbyopia is a common ailment, for which trifocals are suggested. Trifocals, by rectifying three different areas of vision allow you to have a better vision strength than bifocals.
Features of Trifocals
•The lower region of a pair of spectacles involves the modification. It looks like a semi circular arc at the lower end. Not only o you have a vision rectification, you also have an intermediate vision rectification at the bottom of the lenses. These two portions are separated by a line.
•Your specific shortsightedness might be related to a particular region of your specs. The bottom part is associated with correcting shortsightedness.
•Above the bottom region is found the immediate rectification region that deals with vision of the not too far or not too near. This is a specialty of trifocal lenses. This area has a short range. But that range can be expanded too.
•The highest part of the specs is associated with distant vision. The hyperopic or myopic patient can make use of this region.
Presbyopia is a common ailment for which is suggested trifocal lenses. For people crossing forty this is crucial. This ailment is starkly different than hyperopia or myopia. This comes about with old age. Presbyopia has no preventive or solution by way of medication. Lasik surgery is the cure or you could resort to wearing reading glasses or contact lenses.
Author Resource:
Suzanne Hughes is an eyewear style consultant specializing in http://www.readinstyle.com/catalog/DesignerReadingGlasses.aspx reading glasses online. For more information about eyeglasses, vision, or great styles such as http://www.readinstyle.com/catalog/Scojo.aspx Scojo reading visit her online
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