Visual acuity measures how a person’s eyesight is from 20 feet away. Someone with normal vision can see something clearly from 50 feet away, while someone with 20/50 vision can only see it clearly from 20 feet away. Distance vision was considered “improved” if corrective measures raised the visual acuity to 20/40 or higher.
Many state driving tests require at least one eye to see 20/40 without glasses (for driving without glasses). People who have vision loss of 20/50 or worse often need cataract surgery if that is what caused their vision loss.
People often have more than one sign that they might need to get their eyes checked. Some of these are headaches, sore eyes, frowning or squinting, and a general feeling of discomfort. If you see flashes and floaters, lose your sight suddenly, or have eye pain, you should see a doctor.
Do you have sore eyes from squinting?
Even though tired eyes are annoying, they don’t hurt the eyes. There are no long-term effects of eye strain caused by too much or too little light or using a computer for a long time. But eye strain won’t hurt or change how your eyes are made. Vision problems can be fixed by wearing glasses or contacts. These help the eye focus light on the retina in the best place possible. One person’s perfect vision with a pair of glasses may be blurry to someone else. This is because each person’s eyes are unique.
On the other hand, “brain retraining,” a new type of education, could keep you from needing reading glasses as you get older. Several studies have shown that it works, but no treatment works for everyone. Your inability to focus could be caused by presbyopia, a loss of vision that comes with age. Presbyopia can happen if your eyes are too farsighted, too nearsighted, or if they are not straight. Presbyopia is when your eyes gradually lose their ability to focus on things close up.
A common myth is that it’s good to “take a break” from your glasses or that wearing corrective lenses all the time will hurt your eyes. Your eyesight will never get worse because you wear glasses or contacts.
People with blurry vision in both eyes often have nearsightedness or farsightedness, which can be fixed with eyeglasses or contact lenses.