Myopia or Hyperopia is the opposite of farsightedness
It is the opposite of nearsightedness; it is the opposite of astigmatism. It occurs when your nearsightedness and farsightedness are both present at the same time. For most people the symptoms will not be noticeable until they get to middle age, but for others the problem can surface much later in life. For those I will describe here the treatments available for nearsightedness and farsightedness, which can be used to treat the symptoms.
For a nearsighted person the standard prescription is a normal (farsighted) bifocal lens; this is the simplest and cheapest option for correction. A normal lens has two powers (complementary), a short focal length (meant to focus near objects) and a large diameter (to focus on far away objects). The short focal length changes the distance, the eye needs to focus and is called the optical correction. For the nearsighted person the distance, the eye needs to focus does not need to be larger than the diameter of the lens, but must be smaller than 20mm.
The most popular option for the farsightedness sufferer is a bifocal contact lens
For a farsighted person the prescription would be different, it is possible to use a longer lens in order to correct both nearsightedness and farsightedness, but the overall cost would be higher because the longer lens is usually more expensive than the normal lens. The most popular option for the farsightedness sufferer is a bifocal contact lens, they are the cheapest option available and also provide a great optical correction. The main downside to a bifocal contact lens is that they are more difficult to fit than other designs. They can be an inconvenience and therefore many people choose to continue wearing glasses.
There are also some glasses called progressive spectacles that can help improve the ability to see far away objects. These spectacles have lenses that change the shape and increase the amount of light allowed through the lens. Although these glasses are a lot more expensive than other types of glasses, this helps to counter the problems of nearsightedness or farsightedness by helping to improve the ability to see clearly at various distances. This type of glasses also help the wearer to be able to read printed material easily.
Presbyopia treatments such as progressive spectacles
Although the majority of sufferers are able to correct their nearsightedness and farsightedness with the use of bifocal contact lenses many people suffering from presbyopia suffer from a much more serious vision disorder known as presbyopia. The visual range for people suffering from presbyopia is very narrow and can affect many different activities such as reading, watching television and driving.
If you suffer from one or both conditions then it is important to visit your local optician to discuss the best way forward. Your optician will be able to test you for both conditions and recommend a course of treatment for your specific needs. If your nearsightedness or farsightedness is not due to a hereditary condition and your eyesight has been deteriorating, you may wish to consider the option of eye surgery. However, if your condition is due to an inherited genetic disorder such as cataracts then your nearsightedness or farsightedness may be easier to treat using the alternative treatments described above.