In the past an eye test complex sitting in an test chair and looking through a gismo that would scare most children, then declaring "better" or "worse" until the Optometrist was satisfied. This recipe is approved in most circumstances, but due to the subjective nature of the exam, the designate can be inaccurate. This type of exam isn't able to detect other conditions that may exist either.
Advances in the field of eye surgery has brought a new recipe of test to the table though, Wavefront. With Wavefront all the "better" and "worse" is taken out, and this technology can diagnose a wider range of conditions. The best part of this is that now this technology can be applied to eyeglasses as well as eye surgery.
In a favorite type of wavefront exam a light is reflected off of the back of your eye (the retina) and a map is made from the way that the light travels in your eye. This exam is simple, requires no subjective input, and is practically instantaneous. More accuracy is assured with this method, and more conditions can be corrected from this map.
As pointed out before, this technology can be applied to eyeglass lenses, here's how. In optical laser surgery, such as Lasik, a wavefront map is used to guide and optimize the laser that creates a convention eye surface (cornea) to achieve the best focus possible. Now manufacturers are using this same precision to spoton tasteless issues like nearsightedness, farsightedness, and astigmatism along with the higher-order conditions.
Wavefront type lenses are advertised to be the way to achieve a crisper, clearer view as compared to the approved type lenses, but will probably not be covered by an insurance policy. The cost of these lenses is commonly 25%- 35% more expensive than the approved lenses, depending on the lenses you select.
With the added benefits of wavefront mapping, lens companies have started using digital improvement on both sides of the lenses. This type of improvement allows for a finer precision in construct process resulting in a lens more suited to the wearer. Additional benefits of wavefront technologies are being developed. The Dod granted .5 million dollars to PixelOptics Inc. For the amelioration of an adaptive lens law that is referred to as supervision lenses.
In light of these advances, many companies have started to delve into this technology and are now producing wavefront inspired lenses. One company, iZon, produces very regarded and specialized lenses requiring a specialized machine that creates an optical fingerprint for each eye.
Other companies using this technologies without requiring the wavefront diagnosis are: Varilux (Essilor of America,) Carl Zeiss Vision, Shamir Insight, Hoya Lens of America, Seiko/Pentax, and Signet/Armorlite.
Seiko seiko 5 automatic
No comments:
Post a Comment