why do my progressive lenses have distortion
You've passed your 40th birthday, and you're having trouble reading or seeing objects up close. Maybe you've tried to carry store-bought readers around with you, but your eye doctor suggests progressive lenses. Should you take the plunge? What Are Progressive Lenses? Progressive lenses have three prescriptions in one pair of glasses. That allows you to do close-up work (like reading a book), middle-distance work (like checking out a website on a computer), or distance viewing (like driving) without needing to change your glasses. They're sometimes called multifocal lenses. Progressive lenses are an update on bifocal and trifocal lenses. Both of these more traditional types of glasses have telltale lines in the lenses. Progressives have a seamless look. Sometimes they're called "no-line bifocals," but that's not quite right. It would be more accurate to call progressive lenses "no-line trifocals. "
Who Uses Progressive Lenses? Almost anyone with a problem can wear these lenses, but doctors often prescribe them for people over 40 whose blurs when they're doing close-up work like reading or sewing. This condition is called. It's a natural part of getting older. Even people who are and over 40 may find that their near vision blurs when they wear glasses for distances. Talk to your doctor to see if progressives are an option for you. With progressive lenses, you won't need to have more than one pair of glasses with you. You don't need to swap between your reading and regular glasses. Vision with progressives can seem natural. If you switch from viewing something up close to something far away, you won't get a "jump" like you would with bifocals or trifocals. So if you're driving, you can look at your dashboard, at the road, or at a sign in the distance with a smooth transition.
They look like regular glasses. In one study, people who wore traditional bifocals were given progressive lenses to try. The study's author said most made the switch for good. It takes time to adjust to progressives. You need to train yourself to look out of the lower part of the lens when you're reading, to look straight ahead for distance, and to look somewhere between the two spots for middle distance or computer work. Some people never adjust, but most do. During the learning period, you may feel dizzy and nauseas from looking through the wrong section of lens. There may also be some distortion of your (what you see on the edges when looking straight ahead). Another thing to consider is the cost. Progressive lenses cost at least $100 more than traditional bifocals. Ok, you have just gotten your new bifocals and you are wondering how you are ever going to get used to wearing them. Hopefully these tips will make the transition into multi-focals easier and quicker for you. If you donБt normally wear glasses for distance viewing, the most important thing you can do to become comfortable wearing your lenses, is to take a week and wear your glasses full time. Even where you may not have the need to wear them, leaving them on will allow you to adapt much quicker. People who wear their glasses for an hour or two at a time expecting to gradually get used to them, are often still trying to adjust two or three years later. Once you are adapted to your lenses, wearing them part time is no problem. One exception to this is: you should not drive in your progressives until you feel comfortable in them.
Usually after a day or two, this is no problem. Use common sense and be safe in your glasses, but wearing them more will get you adjusted sooner. When people donБt need a bifocal to read, they generally turn their head slightly down so they are looking directly at their reading material. When you are using a bifocal, if you turn your head down you move your bifocal down. Remember to keep your head still, and lower your eyes. This often feels strange at first. It feels like you are holding your head back. But if you watch people do this, they donБt hold their head back, they fight the tendency to drop their head down. The next adjustment to make is looking through the correct part of the lens for your reading distance. Since progressives have no lines and there is a gradual change in power, sometimes it is difficult at first to find the right area to look through. Many people return after a day or two with their new lenses and report; БI canБt tell where I should be looking through these lenses,Б БI move my head all around trying to find the right spot. Б When you first get your lenses, hold your head still, drop your eyes, and pick out one word. Watch that word as you slowly move your reading material, up, down, and side to side. You can easily tell when you are too high, too low, or too far to the side. Remember, move the reading material at first, not your head. It wonБt be long before your eyes automatically go to the right spot. Another concern with new wearers is the distortion that is produced in the lower, outer portions of their glasses. In order to keep the optics clear and changing down through the center of your lenses, the lenses will produce distortion down and out to the sides.
If you try to look through this part of your glasses, things will appear wavy and distorted. This is an area you donБt normally use in your glasses. If you are going to look at something down and out to the side, you donБt hold your head still and turn your eyes, you automatically turn your head. When you do this then you are looking through the central area of your lenses. You will notice the distortion in your periphery at first when you move your head side to side, but after a short time you will not be aware of it. It does not limit your peripheral vision. The other common concern a lot of patients report is difficulty going up and down stairs in their bifocals. Remember the reading area of your glasses is made to be in focus at about an 18Б distance. If you look through the bifocal portion at the floor, the floor is out of focus. What happens is when a person who is wearing bifocals for the first time, gets ready to go up a set of stairs, they think: БOh, I have my bifocals on. Б They then look down through the bifocal area at their feet, and they try to go up or down the stairs watching their out of focus feet. Normally as you go up and down stairs you donБt watch your feet and you donБt want to do that with your bifocals on either. If you need to look down at something with your bifocals on, you simply turn your head down more than you usually would so you look over top of the bifocal area. It is likely that you would make all these adjustments automatically after awhile. However, if you think about them at first, it will make your successful adaptation into wearing progressive lenses, much quicker and more comfortable.
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