To see clearly, light must pass through the front of your eye and focus perfectly on the back of your eye. The back of the eye is called the retina. It acts like a screen that catches light and turns it into pictures. Refractive errors happen when the shape of your eye keeps light from focusing correctly on this screen.

When light does not bend the right way, the images you see become blurry. Refractive errors are not eye diseases. They are simply problems with the physical shape and size of your eyeball, cornea, or lens. They are the most common reason people need to wear eyeglasses or contact lenses.

There are a few main ways that the shape of an eye can cause blurry vision. Each type affects your eyesight differently:

• Nearsightedness (Myopia): This happens when your eyeball is slightly too long from front to back, or when the front curve is too steep. Because of this, light focuses in front of your retina instead of directly on it. People with nearsightedness can see things close up very clearly, but objects that are far away look blurry and fuzzy. This makes it hard to read road signs or see a chalkboard at school.
• Farsightedness (Hyperopia): This is the opposite of nearsightedness. It happens when your eyeball is too short, or the front curve is too flat. Light focuses behind your retina. People with farsightedness can often see objects in the distance clearly, but things that are close up—like a book or a smartphone screen—look very blurry.
• Presbyopia: This is a natural type of farsightedness that happens to almost everyone as they get older. As you age, the natural lens inside your eye becomes stiffer and less flexible. This makes it hard for the eye to change its focus to see things close up. Most people start to notice this after the age of 40 when they have to hold a menu or a book far away at arm’s length just to read the words.

Astigmatism is another very common refractive error, but it is a bit different from being nearsighted or farsighted. It happens when the clear front window of your eye, called the cornea, is shaped incorrectly.

A normal, healthy cornea https://pendkareyeclinic.com/ is perfectly round and smooth, shaped like a round ball. When you have astigmatism, the cornea is shaped more like an egg or an American football. It is curved more in one direction than the other. Because the front of the eye has an uneven shape, light gets bent in multiple directions at the same time. This causes vision to be blurry, distorted, or stretched out at all distances, whether you are looking at something near or far away.

The most obvious sign of a refractive error or astigmatism is that you cannot see things clearly. However, there are other common symptoms that you might experience:

• Squinting: You find yourself constantly squeezing your eyes together to try and clear up your vision.
• Eye Strain: Your eyes feel tired, sore, or heavy, especially after reading or working on a computer.
• Headaches: You get frequent headaches around your forehead or temples from straining your eyes.
• Double Vision: You see two images of a single object instead of one.

An eye doctor can easily find refractive errors and astigmatism during a standard eye test. Once the doctor knows the exact shape of your eye, they can recommend a few safe ways to fix your vision:

Eyeglasses: This is the easiest and safest way to correct your sight. The curved glass lenses bend the light before it enters your eye, helping it focus perfectly on your retina.

Contact Lenses: These are tiny plastic lenses that sit directly on top of your eye. They work just like glasses but offer a wider field of view and are great for sports. Special contact lenses called “toric lenses” are used to match the uneven shape of astigmatism.

Laser Eye Surgery: For adults who do not want to wear glasses or contacts, procedures like LASIK use a precise laser beam to gently reshape the front of the eye. This allows light to focus correctly on its own.