Viễn thị - Bệnh Viện Mắt Quốc Tế DND - Bắc Giang

Viễn thị là gì?

Định nghiã: là mắt có công suất khúc xạ kém so với chiều dài của mắt, vì thế các tia sáng song song vào mắt sẽ hội tụ ở sau võng mạc.

Hyperopia, or farsightedness, is a common vision problem, affecting about a fourth of the population. People with hyperopia can see distant objects very well, but have difficulty focusing on objects that are up close. The condition is sometimes referred to as “hypermetropia” rather than hyperopia.

Hyperopia Symptoms And Signs

Farsighted people sometimes have headaches or eye strain and may squint or feel fatigued when performing work at close range. If you get these symptoms while wearing your eyeglasses or contact lenses, you may need an eye exam and a new prescription.

What Causes Hyperopia/Hypermetropia?

This vision problem occurs when light rays entering the eye focus behind the retina, rather than directly on it. The eyeball of a farsighted person is shorter than normal.
Many children are born farsighted, and some of them “outgrow” it as the eyeball lengthens with normal growth.
Sometimes people confuse hyperopia with presbyopia, which also causes near vision problems but for different reasons.

Hyperopia Treatment

Farsightedness can be corrected with glasses or contact lenses to change the way light rays bend into the eyes.
If your glasses or contact lens prescription begins with plus numbers, like +2.50, you are farsighted.
You may need to wear your glasses or contacts all the time or only when reading, working on a computer or doing other close-up work.
Refractive surgery, such as LASIK or CK, is another option for correcting hyperopia. Surgery may reduce or eliminate your need to wear glasses or contact lenses.
Investigational procedures involving corneal implants may be a future option for correcting hyperopia.