• Progressive lenses are corrective lenses used in eyeglasses to correct various vision disorders, such as presbyopia, when the eye's ability to focus on near objects diminishes with age. People who use progressive lenses are often adults older than 40 who have trouble reading small print. Progressive lenses can benefit those with vision problems, but there are issues associated with using them.
  
  

Vision Distortions

• Some lenses will cause you to experience astigmatism, which means you will see blurriness or distortion around the edges of the lens. This is due to the lenses, not your eyes.
  
  

Incomplete Sharpness

• You will not get 100 percent-sharp vision everywhere you look with progressive lenses. Normally, your eyes move left and right to build a sharp image in your mind. However, because of the focus design of progressive lenses, there will be blind spots. Your brain will receive some not-so-sharp images, typically on the left and right sides of the lenses, according to Velocity Press.
  
  

Problems for Sensitive Groups

• If you are sensitive to motion sickness, it may be tough to adjust to progressive lenses, especially if you have a strong prescription. You could get a whirling sensation from putting them on, which might take getting used to. Don't go back to old glasses to rest the eyes, Velocity Press says. Instead, allow your brain to get used to the new glasses over the next week or so.