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How To Choose The Best Lens For You?
Prescription lenses are available in various types. There are blue control lenses to filter out the blue light, photochromic or transition lenses to reduce glare, myopic control lenses to control the myopic progression among kids, anti-fatigue lenses for your digitally connected life and so on. All lenses serve their unique purposes, depending on individual lifestyle!
Fascinating, isn't it? But, are those everything about lenses?
Well, prescription lenses are either plus or minus in power. Plus lenses are used to correct hyperopia (long-sightedness) or presbyopia, while minus lenses are to correct myopia (short-sightedness).
Plus lenses magnify the images; in contrary, minus lenses minify them. Of course, as your eye power increases, the lenses appear thicker; hence, the more the lenses magnify or minify the image that you perceive.
In fact in the market, we have various types of single vision lenses sorted according to their surface designs; namely spherical, aspherical and double-aspherical lenses!
Spheric, Aspheric and Double Aspheric: What Are The Impacts
They are actually lenses of different curves on the front and back surfaces. These different curves are especially crucial for those who have high prescription power. For instance, different lens designs affect the wearer’s field of view, the optical quality as well as the wearing aesthetics. Now, let’s have a look briefly on the features of different lens designs:
Of course aesthetically, they make a difference too! Here’s how:
Spheric
Aspheric
Double Aspheric
*Images above are only for illustration purpose of having moderate plus power.
Thick or Thin Lenses: Why Are They Important?
There is this misconception about single vision lenses that the moment you get expensive ones, you are tricked. The fact is, lenses which are higher-priced do have the value that fits individuals differently. As your eye power increases, the lenses appear thicker; hence, the more the lenses magnify (plus lenses) or minify (minus lenses) the image that you perceive. Having said that, lenses of high prescription power have an impact on the relative magnification of the images viewed and the cosmetic appearance of your eyes too!
Spheric
Minus Lens for Myope
Plus Lens for Hyperope
Spherical lenses have the same curve across the entire surfaces, the front surfaces are spherical in shape, very much like a circle.
For hyperopes, the stronger the prescription, the more the plus lenses bulge forward centrally. In contrary for myopes, the edge of the minus lenses is thicker for stronger prescription. This condition results in more distortion with smaller field of view. In addition, the lenses are much heavier.
Aspheric
Minus Lens for Myope
Plus Lens for Hyperope
Aspherical lenses have more unique front surface (more like shape of an oval) that gradually changes in its curvature from the center of the lens out to the edge; even thinner with higher index.
In aspherical lenses, the front surfaces are made with much flatter curves, hence less bulging of the lenses from the frame. Such lenses give the eyewear a slimmer and more flattering profile
Double Aspheric
Minus Lens for Myope
Plus Lens for Hyperope
In double aspherical lenses, the peripheral power error and astigmatic aberration are being distributed in a balanced manner across the surfaces. By utilizing free-form technology, double aspherical lenses are customized to wearer’s prescription power in a precise manner, providing a significant improvement in the lens effective viewing area. Vision with such lenses is therefore the closest to real images, with minimal magnification or minification, delivering an exceptional optical quality.
The more you know now!
In a nutshell, there is no definite factor that is able to determine the lenses that fit your visual needs without a proper assessment. In fact, the choice of frames and lenses depends on the strength of your eye power, visual expectation, occupation and even your lifestyle. Surely, we are more than happy to assist you along the road of getting your very own eyeglasses! For more information, do visit us and talk to us about your needs, we will definitely get you one that complements your distinct image!