General chatter - A question about bifocals.




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Autumn Night
04-24-2012, 10:03 AM
Last fall my eye doctor put me in no-line bifocal lenses (not a cheap lens). I wore them every day for two weeks, but I could not adjust. I went back to my old prescription. Has anyone else tried bifocals and couldn't wear them? I am definitely starting to have problems with my near vision. I am considering getting a seperate pair of reading glasses. Has anyone else tried this? I have also thought about getting the old fashioned lined bifocal. I think this would give me a much larger area of in focus distance vision. Can anyone compare their experience with no-line bifocals and lined bifocals?

Thanks.

Donna


nelie
04-24-2012, 10:35 AM
My husband had issues but only because his lense was too small. He went to a bigger lense and a different type of no-line bifocal. His issues went away. Have you talked to the optometrist about your issues? They may have some recommendations on fixing the issue.

SensualSiren
04-24-2012, 11:04 AM
I used to work as a certified optician. If you had trouble adjusting, you should try a better quality lens and/or have them check your measurements. The cost is high, but your quality of vision will be sooooo much better than with a lined bifocal. People think that they will get more lens area to see through with a lined bifocal, but they are incorrect because the Rx is not correct over the entire surface area of the lens. When you start with your lens blank, which is a giant circle that will be cut to fit the frame, the Rx is in the center of the lens. If you deviate from the center, you create prism in the lens, which distorts the image. This means that if your measurements are off or if you move your glasses from where they were measured to sit you will experience distortion. As a result, when you have a large lens in your glasses you do not actually have that entire surface area to see through. Your brain/eyes automatically figure out where to look through, though improper measurements may make this impossible. In addition, the bifocal area of a lined bifocal is accurate at the top center area of the little half circle at the bottom of the lens. Based on your measurements, the half circle (think of a bisected lens blank) is positioned below your eye (a little closer to your nose because your eyes converge when you read) so that you can look down and read. It does not matter how large the bifocal area is because you only have a small area that is usable for your Rx. The only exception to this bigger-is-not-better rule is a pair of glasses that is too small. Usually, this does not happen unless you find a really small frame.

My advice is to upgrade to a better lens and to make sure that the measurements are correct. I know that it is hard to spend the money, but think of how often/long you wear your glasses. It always amused me that people would try to cut corners on their glasses when they would go blow a bunch of money at the mall/Walmart. Also, try to find an optical store that will remake the glasses until you are happy. At the location where I worked, our manager would remake the glasses as many times as was needed when people had problems. This is obviously not true everywhere, as the first location where I worked was different (and they are both part of the same organization). The reason that no-line lens are so much better is that they provide you more natural vision than the line, including a computer distance area in the middle (kind of like a trifocal).

Hope this helps.


Autumn Night
04-24-2012, 11:45 AM
Thanks for the suggestions. I was told that the lenses I received were very good quality. I paid nearly $300 more than what my insurance would cover. I honestly think the problem was with the measurements. The technicians do all the glasses fittings manually. They just "eye ball" the measurements, which maybe O.K. for single vision lenses, but not sufficient for bifocals. I really like the doctor, but may go somewhere else for my next exam.

SensualSiren
04-24-2012, 11:55 AM
It is probably due to measurements, though I'm not sure about the price inflation on the lenses. :( Where I worked, we did measure from the pupil to the bottom of the lens manually, but we also had stickers that verified our measurements. If they are measuring the distance between your pupils manually, then that is super backwards. The doctor might be willing to provide this measurement for you, which would be more accurate. :)