Do you sometimes find it difficult to see things that are close or far away? When you read a book, the letters become blurry? Or when you walk down the street, you can't see the number on the bus? These are really problems that many people have. Today, we are going to talk about these eye vision defects, or as doctors call them, `(Refractive Errors)`.
What are refractive errors?
Simply put, a refractive error is a change in the natural shape of your eyes that causes your vision to become blurry. These are the most common vision problems that many people experience.
Think about it, our eyes work like a team. When light enters the eye, it travels through each part until it reaches the brain.
1. Light first passes through the clear part of the eye, the cornea .
2. This is the part of the eye that focuses light and sends it through the lens inside the eye.
3. This light then falls as a signal on the layer at the back of the eye, the retina .
4. The retina converts this light into electrical signals and sends them to the brain via the optic nerve .
5. Ultimately, it is the brain that uses these signals to create the images we see.
Now, depending on the type of refractive error you have, the things you see are not focused properly due to a change in the shape of your eyeball, cornea, or lens. This is what causes your vision to be distorted and blurry.
There are several types of this vision problem. Some make it difficult for you to see things up close. Others make things far away blurry. But no matter what type of problem you have, an eye specialist can diagnose and treat it. They will examine your eyes and vision and prescribe the treatment you need to see clearly again.
Most of the time, these vision problems develop as we grow and develop. Many problems first appear in young children. However, you can develop these problems at any time in your life, even if you had good vision before.
See an eye specialist as soon as you notice any changes or worsening of your vision. Even if you already wear eyeglasses or contact lenses, it is important to have your eyes checked regularly.
What are the types of refractive errors?
There are four common types of vision problems:
1. Myopia - nearsightedness is good
People with nearsightedness, or `(Myopia) , cannot see things that are far away clearly, but they can see things that are close by clearly. For example, if you have `(Myopia), you may not be able to see the name signs on the side of the road clearly, and they can only be seen when you get close to your car or when they are right outside your window. Imagine, some children say that they cannot see what is written on the blackboard at school, but they can read what is written in the book clearly. This may be because of `(Myopia).`
Myopia usually occurs when your eye is too long from the front to the back. Sometimes, myopia can also occur if your cornea or lens is too curved.
Myopia usually occurs most often in children around the age of 10.
2. Nearsightedness (Hyperopia) - Distance vision is good
Nearsightedness, or `(Hyperopia),` makes it difficult to see things that are close to you clearly. This is the opposite of `(Myopia).` If you have `(Hyperopia),` you can see things that are on the TV across the room clearly, but you have trouble reading the text that is being typed on the laptop in front of you. Some people find that when they try to read a newspaper or a book, the text becomes blurry and they have to hold it up to look at it from a distance.
Hyperopia occurs when the length of your eye decreases from the front to the back. Another cause is when your cornea or lens is too flat (i.e., not curved properly).
People with hyperopia are usually born with it.
3. Presbyopia (nearsightedness) that occurs with aging
Presbyopia, or nearsightedness, is a condition that occurs with age. Like hyperopia, presbyopia makes it difficult to see things up close. This is often the reason we have to wear reading glasses as we get older. This is why our mothers, fathers, and grandparents used glasses to thread a needle and read newspapers.
Presbyopia occurs when the lens of your eye becomes less flexible and less able to focus as well as it used to. It usually occurs in people over the age of 40.
4. Astigmatism
Astigmatism can cause blurred vision at any distance. Our eyes are normally round, right? But if you have astigmatism, your eye is shaped like a rugby ball, or the back of a spoon. This causes the light entering your eye to bend and distort excessively. This means that it can focus in several places instead of focusing in one place.
Astigmatism can occur at any time in life. Some people are born with it. For others, it develops later in life.
What are the symptoms of a refractive error?
All eye diseases can impair your vision. In addition to making it difficult to see clearly, you may also experience symptoms such as:
- Blurred vision of objects near, far, or both.
- Double vision (`Diplopia`).
- Headache.
- Squinting. If you constantly squint or squint your eyes, that's a sign.
- Eye strain.
- Eye pain.
Sometimes, young children may not realize that their vision is failing. If your child has trouble focusing on one thing for a long time, or their grades suddenly drop, they may have a vision problem. If you notice any changes in your child's eyes, vision, or behavior, see a pediatrician or an ophthalmologist.
What are the causes of these refractive errors?
Vision problems can be caused by changes in the shape of your cornea, lens, or the entire shape of your eye. The type of problem you have depends on how your eye is shaped.
These can also occur as you age. As your eyes age, you may develop new vision problems that weren't there when you were younger.
Some people may experience vision problems even after cataract surgery.
How to identify refractive errors?
An ophthalmologist diagnoses vision problems through an eye exam . They will look at your eyes (including the inside). They will also give you a visual acuity test . This can help determine what type of vision problem you have and how much it is affecting your vision.
How are refractive errors treated?
The treatments for vision problems are:
- Eyeglasses.
- Contact lenses.
- Vision correction surgery - for example, surgeries like LASIK and Photorefractive Keratectomy (PRK).
Usually, your eye doctor will prescribe glasses or contact lenses before you have vision correction surgery. However, you may be a candidate for surgery right away. Talk to your eye doctor about which treatment is best for you.
Can the risk of developing refractive error be reduced?
In fact, there is usually nothing you can do to prevent your eyes from developing a vision defect. Because these are caused by the shape of your eye, the cornea, or the lens, or by changes in these parts, there is no way to prevent vision defects. And there is nothing you can do to prevent your child from being born with a vision defect.
What happens if I have a refractive error?
Even if you have to wear glasses or contact lenses, or have vision correction surgery, because you have a vision defect, it will not have a major impact on your health.
The prescription or strength of your glasses or contact lenses can change over time. Some people who have vision correction surgery may experience a slight loss of vision over time (regression) – that is, the effects of the surgery gradually diminish.
If you have a vision problem, you are at higher risk of developing other conditions that affect the eyes. Examples:
- Glaucoma.
- Lazy eye (`Lazy eye / Amblyopia`).
- Crossed eyes / Strabismus.
- Low vision.
How often should I have my eyes checked?
By regularly checking your eyes and vision, an eye specialist can detect any problems early. How often you should have your eyes checked usually depends on your age:
- Children: Your child should have their eyes checked by their pediatrician around the time they are learning to read, and then every one to two years after that.
- Adults under 40: Every five to ten years.
- Adults between 40 and 54 years of age: Every two to four years.
- Adults over 55 years of age: Every one to three years.
If you wear glasses, contact lenses, or need another visual aid, you may need to have your eyes checked more often. People with diabetes also need to have their eyes checked more often.
Ask your eye specialist how often you should have an eye exam.
When should I see my doctor?
See your doctor or ophthalmologist as soon as you notice any changes in your eyes or vision.
If you have any of the following symptoms , go to a hospital emergency department immediately:
- Sudden loss of vision.
- Severe eye pain.
- If you see new flashes or floaters in your eyes.
What questions should I ask my doctor?
- What type of vision problem do I have?
- What kind of glasses/contact lenses do I need?
- Am I suitable for vision correction surgery?
- How often should I have an eye exam?
Take-Home Message
Vision problems are a very common eye problem that many people experience. No matter what type of problem you have, your eye doctor can find a treatment that will help you see clearly again. Even if your vision doesn't seem to have changed much, see your eye doctor regularly. Sometimes, small changes in your eyes or vision can make an existing problem worse or cause a new one.
If your child suddenly starts to squint, complain of headaches, or notice a drop in their schoolwork, they may have an eye condition that they may not know is treatable. That's why it's important to seek medical advice at times like these. Our eyes are very precious, so let's take care of them!
` Eyesight, vision problems, myopia, hyperopia, astigmatism, glasses, eye health
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