Sudden Vision Loss or Blurred Vision
Anyone who notices a sudden loss or blurring of their vision should see their eye doctor immediately. There are many eye diseases that could cause permanent loss of vision especially if not diagnosed and treated early.
Gradual Vision Loss or Blurred Vision
Common Causes for Blurred Vision not Related to Any Eye Disease or Permanent Loss
Myopia or Nearsightedness
In children or teenagers a gradual change in vision is commonly due to them becoming nearsighted or myopic. As they grow their eyes grow as well and in simple terms an eye that is nearsighted is larger than average and has a cornea that is steeper than the average. The myopia continues to increase until the late teens or early twenties. Someone should not consider vision correcting procedures such as LASIK for myopia until their eyes have stabilized around age twenty one.
Hyperopia or Farsightedness
Hyperopia occurs early in childhood as their eyes are smaller. People with hyperopia have smaller than average size eyes and flatter than average corneas. Many children with a significant amount of hyperopia have crossed eyes. This is typically found by the pediatrician or noticed by the parents. Children even without any evidence of an eye problem should have their eyes checked by an eye doctor around age 4.
Hyperopia shows up again around age 40 as the eye loses the ability to focus. People may begin to notice blurred vision and will need glasses. The hyperopia slowly progresses through the forties and fifties. People should not have vision correcting procedures for hyperopia such as LASIK for hyperopia until their eyes are stable.
Presbyopia is the loss of accommodation or the ability to focus from distance to near. Everyone in their forties begins to have presbyopia. You gradually have difficulty focusing on near objects or feel like their arms are not long enough as you push things further away to read.
Anyone with a sudden loss of vision needs to see their eye doctor immediately. A person with a gradual loss of vision still needs to see their eye doctor though not as an emergency.