If you are among the group of people who are both nearsighted and farsighted, the only option available to you is glasses with big, thick bifocal lenses. Frames like these are big and heavy, and don’t generally complement the wearer’s face. Bifocal lenses of the older type were hard to get used to. Fortunately, the latest bifocal contact lenses are much improved over the old.
In the older days, glasses used to be the only option. Bi focal lenses were the last to be developed. Fortunately things have come a long way since then. Today, there are many more choices available. You never have to wear those big clunky frames anymore! You can now get a pair made of rigid, soft and gas permeable materials.
The cause for this need is called ‘presbyopia.’ It usually occurs after someone is 40 years old. Since wearers of such lenses are partly nearsighted and partly farsighted, they are designed so that half the lens can view up close and half the lens can see far away.
The way such lenses are made is called ‘simultaneous design.’ They have both circle powers, so that your pupils can adjust to whichever it needs, whether near or far away. There is another style though and this is called Concentric Design. With these lenses, the inner part is used to focus on what is close and the outer part is for distance focusing.
With Translating Design, the contact lens has a line which divides it. The bottom of it is flat so that it won’t move when you close your eyes.
The Asferic Design enable both near focusing and distance focusing. This is done in the same place.
Usually, the near vision prescription is located in the middle of the contact lens, and the prescription for focusing on distances is in the outer part of it. Depending on your situation, your eye doctor may prescribe the opposite. There is another kind of design where you actually wear a different prescription in each eye.
Usually, the dominant eye gets the far away vision. This will be determined by your doctor. You can also get the Simultaneous Vision type, where you can view both what’s near as well as what’s far at the same time.
Both corrections are controlled by concentric circles in the lens. It can use light from anywhere to focus on what is in front of the eyes.
The only problem with Simultaneous Vision is that light will sometimes bleed over from one correction to the other. This will cause the eye to have some trouble focusing, as it goes in and out of focus.
This puts the burden on your brain to decide which part of the eye to use. Leave it all up to your eye doctor. He will be able to prescribe the right type of lens for you.
Like most other adjustments, it may take a while to find just the right one that is suitable and comfortable for you. Contact lenses are not for all, so it may not be a good idea for you to use a lens correction system. You should leave this decision to your doctor. He can give you the best advice on which to use.
It is wise to keep yourself informed on the newest developments. With many eye care or vision companies you can try a free trial to see if that particular brand and style suits you.
It should not be hard to find discounts on lenses if you look hard enough. Most lens companies want your business, so they will offer you coupons as well as other deals. So, keep searching until you find lenses that are affordable as well as suitable. See if you can find others who have tried these and ask for their opinion. You might be able to get some good advice by searching the internet and look at websites and forums. What you also can find is various kinds of clinical lenses, for example lenses for astigmatism if that is what you need.