People are always confused by the names of some vision problems- these names are often used by specialists or staffs in the filed.
And it is needed to know some details.
Nearsightedness is also called myopia- the two words all refer to the same problem.
Sufferers of this problem will find that they can not see objects in the distance.
This is because the reflected light can not be projected onto the retina.
For this, some vision rectify devices are needed.
Farsightedness and hyperopia are two names of the same vision error.
Sufferers of this problem can not see clearly objects nearby.
This is because reflected light can not be projected onto the retina, but too back.
This problem will occur as people age- people who are over forty are more vulnerable to it.
For this, some treatment is needed.
And what people can do is to wear glasses or receive certain eye surgeries.
Another vision problem that is very common among many people is astigmatism.
People with this problem will find that there are double images in their vision.
In other words, everything they see will be blurred, due double vision.
This problem is very hard to treat in the past, but now some special glasses and surgeries can work nicely.
People who can not focus may suffer from emmetropia- this problem can bring sufferers a lot of discomfort and inconvenience.
People who have myopia may also get presbyopia as they age- this is much obvious when they are over forty.
Sufferers of this problem will find that they can neither see objects in the distance or nearby.
This sounds very horrible, but bifocals, trifocals or progressive glasses are nice alternatives.