Hello, we can not see progressive lenses are bad for eyes, but it does have some side effects. For example, the lines between each prescription may disrupt vision for some, while no-line progressive lenses offer many benefits in this aspect. What's more, people can be difficult to adjust to progressive lenses. And fail to adjust distance vision can make your eyes appears blurry.
Well, generally speaking, there are many people who are trying progressive lenses. And that can be a boom. First, you should know that progressive lenses are very different for they are multi-focal lenses, for they are able to focus points from far to near. And in common, if you have progressive lenses, it is likely to have all the field of vision, such as distant, intermediate, or near things. But they are well designed for many people, so you can just go and console with the professional person, who can just give some advices on it. And then you can have a try.
The progressive lenses owns the function of dividing your eyes into various regions to look, and it is a progress on the basis of bifocal lenses. Progressive lens indeed is more convenient for their advance grinding technology, which will grant the wearer more convenience and comforts of adjusting the change gradually. But wiith other lenses, such as bifocals or trifocals, the reader must get used to looking through the top, middle, or bottom to be able to see a certain distance. Usually eyeglasses combining with progressive lenses are regarded as a perfect match because they match with each other not only functionally but also aesthetically. Therefore, progressive lenses are not bad to eyes but more convenient to eyes.